Reland of Extracting placeholder information from Webkit to Blimp

content/browser/frame_host/render_frame_host_impl.h

Index: content/browser/frame_host/render_frame_host_impl.h
diff --git a/content/browser/frame_host/render_frame_host_impl.h b/content/browser/frame_host/render_frame_host_impl.h
index e9667981ec6ec0426901568d8db38a04f3068e54..3d1d6092fa41056576d03ecc478deb38b94f3852 100644
--- a/content/browser/frame_host/render_frame_host_impl.h
+++ b/content/browser/frame_host/render_frame_host_impl.h
@@ -167,6 +167,7 @@
   void RequestTextSurroundingSelection(
       const TextSurroundingSelectionCallback& callback,
       int max_length) override;
+  void RequestFocusedFormFieldData(FormFieldDataCallback& callback) override;
 
   // mojom::FrameHost
   void GetInterfaceProvider(
@@ -658,6 +659,8 @@
   void OnTextSurroundingSelectionResponse(const base::string16& content,
                                           uint32_t start_offset,
                                           uint32_t end_offset);
+  void OnFocusedFormFieldDataResponse(int request_id,
+                                      const FormFieldData& field_data);
   void OnDidAccessInitialDocument();
   void OnDidChangeOpener(int32_t opener_routing_id);
   void OnDidChangeName(const std::string& name, const std::string& unique_name);
@@ -878,6 +881,9 @@
   std::map<int, JavaScriptResultCallback> javascript_callbacks_;
   std::map<uint64_t, VisualStateCallback> visual_state_callbacks_;
 
+  // Callbacks for getting text input info.
+  std::map<int, FormFieldDataCallback> form_field_data_callbacks_;
+
   // RenderFrameHosts that need management of the rendering and input events
   // for their frame subtrees require RenderWidgetHosts. This typically
   // means frames that are rendered in different processes from their parent