Add a full Blimp integration test.

blimp/client/core/contents/android/blimp_contents_observer_proxy.cc

Index: blimp/client/core/contents/android/blimp_contents_observer_proxy.cc
diff --git a/blimp/client/core/contents/android/blimp_contents_observer_proxy.cc b/blimp/client/core/contents/android/blimp_contents_observer_proxy.cc
index 5584ce82d6d79d245013909bc19cd0d3818cf33a..4a4e883c18e2ef987027271bd1c938f4bfff9592 100644
--- a/blimp/client/core/contents/android/blimp_contents_observer_proxy.cc
+++ b/blimp/client/core/contents/android/blimp_contents_observer_proxy.cc
@@ -58,5 +58,11 @@ void BlimpContentsObserverProxy::OnLoadingStateChanged(bool loading) {
                                                         loading);
 }
 
+void BlimpContentsObserverProxy::OnPageLoadingStateChanged(bool loading) {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  Java_BlimpContentsObserverProxy_onPageLoadingStateChanged(env, java_obj_,
+                                                            loading);
+}
+
 }  // namespace client
 }  // namespace blimp