Reland of Extracting placeholder information from Webkit to Blimp

blimp/engine/feature/engine_render_widget_feature.h

Index: blimp/engine/feature/engine_render_widget_feature.h
diff --git a/blimp/engine/feature/engine_render_widget_feature.h b/blimp/engine/feature/engine_render_widget_feature.h
index b756b2c33093ec145cd88f55a1859a594327761c..4b0fbd1957ee98e6071171d1c1420344e71e5519 100644
--- a/blimp/engine/feature/engine_render_widget_feature.h
+++ b/blimp/engine/feature/engine_render_widget_feature.h
@@ -25,6 +25,7 @@
 
 namespace content {
 class RenderWidgetHost;
+struct FormFieldData;
 }
 
 namespace blimp {
@@ -93,7 +94,7 @@
   // Notifies the client to show/hide IME.
   void SendShowImeRequest(const int tab_id,
                           content::RenderWidgetHost* render_widget_host,
-                          const ui::TextInputClient* client);
+                          const content::FormFieldData& field);
   void SendHideImeRequest(const int tab_id,
                           content::RenderWidgetHost* render_widget_host);