Make //blimp/client/app a real embedder of //blimp/client/public

blimp/client/public/contents/blimp_contents.h

Index: blimp/client/public/contents/blimp_contents.h
diff --git a/blimp/client/public/contents/blimp_contents.h b/blimp/client/public/contents/blimp_contents.h
index b2658e82ede8a3eacb2881b1a4773edfc01ed504..37dd9e4ab7caac9f4d7467db58368978e6ff1ca5 100644
--- a/blimp/client/public/contents/blimp_contents.h
+++ b/blimp/client/public/contents/blimp_contents.h
@@ -45,6 +45,12 @@ class BlimpContents : public base::SupportsUserData {
   virtual void Hide() = 0;
 
 #if defined(OS_ANDROID)
+  // Returns the native BlimpContents corresponding to a Java object of the type
+  // org.chromium.blimp.BlimpContents or nullptr if the lookup fails.
+  static BlimpContents* FromJavaObject(
+      JNIEnv* env,
+      const base::android::JavaRef<jobject>& jobj);
+
   // Returns a Java object of the type BlimpContents for the given
   // BlimpContents.
   virtual base::android::ScopedJavaLocalRef<jobject> GetJavaObject() = 0;