Added constants for Android user policy to the cloud policy protobufs.

chrome/browser/policy/proto/cloud/device_management_backend.proto

Index: chrome/browser/policy/proto/cloud/device_management_backend.proto
diff --git a/chrome/browser/policy/proto/cloud/device_management_backend.proto b/chrome/browser/policy/proto/cloud/device_management_backend.proto
index 4f414bd341e28d7a425de2fac38a9c6826ff5cc0..ab31bfeac181f9c0a2cc328028690f9824e67ef9 100644
--- a/chrome/browser/policy/proto/cloud/device_management_backend.proto
+++ b/chrome/browser/policy/proto/cloud/device_management_backend.proto
@@ -24,6 +24,7 @@ message DeviceRegisterRequest {
     USER = 1;       // Register for Chrome OS user polices.
     DEVICE = 2;     // Register for device policies.
     BROWSER = 3;    // Register for Chrome user policies.
+    ANDROID_BROWSER = 4;  // Register for Android Chrome browser user policies.

[Joao da Silva, 2013/06/15 14:33:03]

Turns out that android builds have an ANDROID macro defined that clashes with
this name. Other suggestions welcome:

  MOBILE_ANDROID
  ANDROID_
  USER_ANDROID

   }
   // NOTE: we also use this field to detect client version.  If this
   // field is missing, then the request comes from TT.  We will remove
@@ -133,6 +134,7 @@ message PolicyFetchRequest {
   //   google/chromeos/user => ChromeSettingsProto
   //   google/chromeos/publicaccount => ChromeSettingsProto
   //   google/chrome/extension => ExternalPolicyData
+  //   google/android/user => ChromeSettingsProto
   optional string policy_type = 1;
 
   // This is the last policy timestamp that client received from server.