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 7c89136bc9656844a692c397e25ead1680cfca5d..9036c228819dc744fb392979650acb287f4baa6f 100644
--- a/content/public/browser/render_widget_host_view.h
+++ b/content/public/browser/render_widget_host_view.h
@@ -24,6 +24,10 @@ class Rect;
 class Size;
 }
 
+namespace ui {
+class TextInputClient;
+}
+
 namespace content {
 
 class BrowserAccessibilityManager;
@@ -80,6 +84,10 @@ 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.

[msw, 2014/04/18 19:57:57]

nit: should this note that certain platforms are not expected to return a
ui::TextInputClient, even if they support text input, like mac and android?

[Yuki, 2014/04/22 09:09:02]

Added a note.

+  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.