Blimp OAuth2 token retreival on application start up.

blimp/client/core/BUILD.gn

Index: blimp/client/core/BUILD.gn
diff --git a/blimp/client/core/BUILD.gn b/blimp/client/core/BUILD.gn
index 6cfad7d81ed9062228f76ec7b994df16e2a71d32..ae2979113dfc7fe9082fb6b8d3c565aefeb6672c 100644
--- a/blimp/client/core/BUILD.gn
+++ b/blimp/client/core/BUILD.gn
@@ -166,12 +166,39 @@ if (is_android) {
     ]
   }
 
+  android_library("auth_java") {

[David Trainor- moved to gerrit, 2016/08/05 15:49:09]

Hmm I wonder if we should just merge all core java files to one target. 
Something to think about.  I think that's how most other android/java folders
work in Chrome IIRC.

[nyquist, 2016/08/05 17:05:07]

My idea with the directory structure would be to have one BUILD.gn file for each
directory. Since this lives in an 'auth' subpackage of core, it should also live
in an auth subdirectory under core, so //blimp/client/core/auth/...

[nyquist, 2016/08/05 17:09:31]

Also, to the point of that's how many other targets do it; most of those targets
also have a single top-level BUILD.gn for all of their code, which usually
matches their old setup with GYP-files. With //blimp/client/core for now being
heavily split up into multiple GN files, and the Java-files mostly being
JNI-passthrough-classes, I still feel like it's helpful to have the
android-specific JNI-bridges and Java files in those directories.

[xingliu, 2016/08/09 04:17:45]

For java files, will have circular deps issue between UI and context.
Currently just try to fix it by moving PreferencesUtil.java to common.

+    visibility = [ "//blimp/client/*" ]
+
+    java_files =
+        [ "android/java/src/org/chromium/blimp/core/auth/Authenticator.java" ]
+
+    deps = [
+      ":common_java",
+      ":switches_java",
+      "//base:base_java",
+      "//blimp/client/public:public_headers_java",
+      "//components/sync/android:sync_java",
+    ]
+  }
+
+  android_library("common_java") {
+    visibility = [ "//blimp/client/*" ]
+
+    java_files = [ "android/java/src/org/chromium/blimp/core/common/PreferencesUtil.java" ]
+
+    deps = [
+      "//base:base_java",
+    ]
+  }
+
   android_library("context_java") {
     visibility = [ "//blimp/client/*" ]
 
     java_files = [ "android/java/src/org/chromium/blimp/core/BlimpClientContextImpl.java" ]
 
     deps = [
+      ":auth_java",
+      ":common_java",
       "//base:base_java",
       "//blimp/client/core:settings_java",
       "//blimp/client/core/contents:contents_java",
@@ -194,6 +221,7 @@ if (is_android) {
     # TODO(xingliu): Remove android support v7 dependency and move android resources to Chrome
     # after Blimp merge to Chrome.
     deps = [
+      ":common_java",
       "//base:base_java",
       "//blimp/client:blimp_java_resources",
       "//blimp/client/public:public_headers_java",