title: Google Sign-In requestIdToken returns null
body: <p>I forked <a href="https://github.com/googlesamples/google-services" rel="noreferrer">this</a> google sample project and ran the android signin.</p>
  
  <p>I set up the options in the google developers console and got a client id, but when running the project the id token comes up null.  </p>
  
  <p>The complete code is <a href="https://github.com/googlesamples/google-services/blob/master/android/signin/app/src/main/java/com/google/samples/quickstart/signin/IdTokenActivity.java" rel="noreferrer">here</a><br>
  This code requests the id token.  </p>
  
  <pre><code>GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
              .requestIdToken(getString(R.string.server_client_id))
              .requestEmail()
              .build();
  </code></pre>
  
  <p>Am I missing something in the setup, any suggestions.  </p>
  
  <p>Here is the Log  </p>
  
  <pre><code>12-04 15:55:59.247 13251-13251/? I/SELinux: Function: selinux_android_load_priority [0], There is no sepolicy file.
  
  12-04 15:55:59.247 13251-13251/? I/SELinux: Function: selinux_android_load_priority [1], There is no sepolicy version file.
  
  12-04 15:55:59.247 13251-13251/? I/SELinux: Function: selinux_android_load_priority , priority version is VE=SEPF_GT-N7100_4.4.2_0033
  
  
  12-04 15:55:59.247 13251-13251/? I/SELinux: selinux_android_seapp_context_reload: seapp_contexts file is loaded from /seapp_contexts
  12-04 15:55:59.252 13251-13251/? D/dalvikvm: Late-enabling CheckJNI
  12-04 15:55:59.362 13251-13251/com.google.samples.quickstart.signin I/dalvikvm: Could not find method android.app.Notification$Builder.setLocalOnly, referenced from method com.google.android.gms.common.GooglePlayServicesUtil.zza
  12-04 15:55:59.362 13251-13251/com.google.samples.quickstart.signin W/dalvikvm: VFY: unable to resolve virtual method 194: Landroid/app/Notification$Builder;.setLocalOnly (Z)Landroid/app/Notification$Builder;
  12-04 15:55:59.362 13251-13251/com.google.samples.quickstart.signin D/dalvikvm: VFY: replacing opcode 0x6e at 0x00c8
  12-04 15:55:59.367 13251-13251/com.google.samples.quickstart.signin I/dalvikvm: Could not find method android.content.pm.PackageManager.getPackageInstaller, referenced from method com.google.android.gms.common.GooglePlayServicesUtil.zzh
  12-04 15:55:59.367 13251-13251/com.google.samples.quickstart.signin W/dalvikvm: VFY: unable to resolve virtual method 453: Landroid/content/pm/PackageManager;.getPackageInstaller ()Landroid/content/pm/PackageInstaller;
  12-04 15:55:59.367 13251-13251/com.google.samples.quickstart.signin D/dalvikvm: VFY: replacing opcode 0x6e at 0x000b
  12-04 15:55:59.402 13251-13275/com.google.samples.quickstart.signin I/GMPM: App measurement is starting up
  12-04 15:55:59.417 13251-13251/com.google.samples.quickstart.signin W/dalvikvm: VFY: unable to find class referenced in signature (Landroid/view/SearchEvent;)
  12-04 15:55:59.417 13251-13251/com.google.samples.quickstart.signin I/dalvikvm: Could not find method android.view.Window$Callback.onSearchRequested, referenced from method android.support.v7.internal.view.WindowCallbackWrapper.onSearchRequested
  12-04 15:55:59.417 13251-13251/com.google.samples.quickstart.signin W/dalvikvm: VFY: unable to resolve interface method 15687: Landroid/view/Window$Callback;.onSearchRequested (Landroid/view/SearchEvent;)Z
  12-04 15:55:59.417 13251-13251/com.google.samples.quickstart.signin D/dalvikvm: VFY: replacing opcode 0x72 at 0x0002
  12-04 15:55:59.422 13251-13251/com.google.samples.quickstart.signin I/dalvikvm: Could not find method android.view.Window$Callback.onWindowStartingActionMode, referenced from method android.support.v7.internal.view.WindowCallbackWrapper.onWindowStartingActionMode
  12-04 15:55:59.422 13251-13251/com.google.samples.quickstart.signin W/dalvikvm: VFY: unable to resolve interface method 15691: Landroid/view/Window$Callback;.onWindowStartingActionMode (Landroid/view/ActionMode$Callback;I)Landroid/view/ActionMode;
  12-04 15:55:59.422 13251-13251/com.google.samples.quickstart.signin D/dalvikvm: VFY: replacing opcode 0x72 at 0x0002
  12-04 15:55:59.462 13251-13251/com.google.samples.quickstart.signin I/dalvikvm: Could not find method android.content.res.TypedArray.getChangingConfigurations, referenced from method android.support.v7.internal.widget.TintTypedArray.getChangingConfigurations
  12-04 15:55:59.462 13251-13251/com.google.samples.quickstart.signin W/dalvikvm: VFY: unable to resolve virtual method 528: Landroid/content/res/TypedArray;.getChangingConfigurations ()I
  12-04 15:55:59.462 13251-13251/com.google.samples.quickstart.signin D/dalvikvm: VFY: replacing opcode 0x6e at 0x0002
  12-04 15:55:59.462 13251-13251/com.google.samples.quickstart.signin I/dalvikvm: Could not find method android.content.res.TypedArray.getType, referenced from method android.support.v7.internal.widget.TintTypedArray.getType
  12-04 15:55:59.462 13251-13251/com.google.samples.quickstart.signin W/dalvikvm: VFY: unable to resolve virtual method 550: Landroid/content/res/TypedArray;.getType (I)I
  12-04 15:55:59.462 13251-13251/com.google.samples.quickstart.signin D/dalvikvm: VFY: replacing opcode 0x6e at 0x0002
  12-04 15:55:59.512 13251-13251/com.google.samples.quickstart.signin D/AbsListView: Get MotionRecognitionManager
  12-04 15:55:59.567 13251-13251/com.google.samples.quickstart.signin D/libEGL: loaded /system/lib/egl/libEGL_mali.so
  12-04 15:55:59.567 13251-13251/com.google.samples.quickstart.signin D/libEGL: loaded /system/lib/egl/libGLESv1_CM_mali.so
  12-04 15:55:59.572 13251-13251/com.google.samples.quickstart.signin D/libEGL: loaded /system/lib/egl/libGLESv2_mali.so
  12-04 15:55:59.637 13251-13251/com.google.samples.quickstart.signin D/OpenGLRenderer: Enabling debug mode 0
  12-04 15:56:12.417 13251-13251/com.google.samples.quickstart.signin D/IdTokenActivity: onActivityResult:GET_TOKEN:success:false
  12-04 15:56:48.477 13251-13257/com.google.samples.quickstart.signin D/dalvikvm: GC_FOR_ALLOC freed 707K, 17% free 9803K/11764K, paused 34ms, total 34ms  
  </code></pre>
  
  <p>Top level build script  </p>
  
  <pre><code>buildscript {
      repositories {
          jcenter()
      }
      dependencies {
          classpath 'com.android.tools.build:gradle:1.5.0'
          classpath 'com.google.gms:google-services:1.5.0'
  
          // NOTE: Do not place your application dependencies here; they belong
          // in the individual module build.gradle files
      }
  }
  
  allprojects {
      repositories {
          jcenter()
      }
  }
  </code></pre>
  
  <p>App level build script  </p>
  
  <pre><code>apply plugin: 'com.android.application'
  apply plugin: 'com.google.gms.google-services'
  
  android {
      compileSdkVersion 23
      buildToolsVersion "23.0.2"
  
      defaultConfig {
          applicationId "com.google.samples.quickstart.signin"
          minSdkVersion 18
          targetSdkVersion 23
          versionCode 1
          versionName "1.0"
  
          testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
      }
  
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  
      packagingOptions {
          exclude 'LICENSE.txt'
      }
  
      // Resolve dependency differences between app and tests
      configurations.all {
          resolutionStrategy.force 'com.android.support:support-annotations:23.1.1'
      }
  }
  
  dependencies {
      compile fileTree(dir: 'libs', include: ['*.jar'])
      compile 'com.android.support:appcompat-v7:23.1.1'
      compile 'com.android.support:design:23.1.1'
  
      // Dependency for Google Sign-In
      compile 'com.google.android.gms:play-services-auth:8.3.0'
  
      // UiAutomatorTesting
      androidTestCompile 'com.android.support.test:runner:0.2'
      androidTestCompile 'com.android.support.test:rules:0.2'
      androidTestCompile 'com.android.support.test.uiautomator:uiautomator-v18:2.1.0'
      androidTestCompile 'com.android.support:support-annotations:23.1.1'
  }  
  </code></pre>
  
  <p>google-services.json file</p>
  
  <pre><code>{
    "project_info": {
      "project_id": "se....-la..da-......",
      "project_number": "6043........",
      "name": "Demo"
    },
    "client": [
      {
        "client_info": {
          "mobilesdk_app_id": "1:6.3....24..:and..id:f62.........40e",
          "client_id": "android:com.example.googlesignindemo",
          "client_type": 1,
          "android_client_info": {
            "package_name": "com.example.googlesignindemo"
          }
        },
        "oauth_client": [
          {
            "client_id": "604...430-uho...slp......v2l........d9...ps.g.....leu........com",
            "client_type": 1,
            "android_info": {
              "package_name": "com.example.googlesignindemo",
              "certificate_hash": "mysha1 fingerprint from debug keystore"
            }
          }
        ],
        "api_key": [],
        "services": {
          "analytics_service": {
            "status": 1
          },
          "cloud_messaging_service": {
            "status": 1,
            "apns_config": []
          },
          "appinvite_service": {
            "status": 1,
            "other_platform_oauth_client": []
          },
          "google_signin_service": {
            "status": 2
          },
          "ads_service": {
            "status": 1
          }
        }
      }
    ],
    "client_info": [],
    "ARTIFACT_VERSION": "1"
  }
  </code></pre>