Redesigns the text input focus handling.

content/public/browser/render_widget_host_view.h

Index: content/public/browser/render_widget_host_view.h
diff --git a/content/public/browser/render_widget_host_view.h b/content/public/browser/render_widget_host_view.h
index 821dc21bf657328bb5ea8ec10829a353ab48745d..12e6e04e042a943241670b2265c2c638eaa16c82 100644
--- a/content/public/browser/render_widget_host_view.h
+++ b/content/public/browser/render_widget_host_view.h
@@ -20,6 +20,10 @@ class Rect;
 class Size;
 }
 
+namespace ui {
+class TextInputClient;
+}
+
 namespace content {
 
 class BrowserAccessibilityManager;
@@ -76,6 +80,13 @@ class CONTENT_EXPORT RenderWidgetHostView {
   virtual gfx::NativeViewId GetNativeViewId() const = 0;
   virtual gfx::NativeViewAccessible GetNativeViewAccessible() = 0;
 
+  // Returns a ui::TextInputClient to support text input or NULL if this RWHV
+  // doesn't support text input.
+  // Note: Not all the platforms use ui::InputMethod and ui::TextInputClient for
+  // text input.  Some of platforms (Mac and Android for example) use their own
+  // text input system.
+  virtual ui::TextInputClient* GetTextInputClient() = 0;
+
   // Set focus to the associated View component.
   virtual void Focus() = 0;
   // Returns true if the View currently has the focus.