Integrate the new input method API for Views into Chromium.

This CL contains following changes:
1. Improve TextfieldViewsModel to support composition text.
2. Implement TextInputClient interface in NativeTextfieldViews.
3. Fix Textfield and native implementations to avoid calling TextfieldController::ContentsChanged() when the text is changed by calling Textfield::SetText() or AppendText().
4. Fix a bug in FocusManager that causes NativeTextfieldViewsTest.FocusTraversalTest to fail.
5. Fix accelerator_handler_touch.cc to send key events to the top-level widget's input method instance instead of the root view.
6. Do the same fix in extension_input_api.cc.
7. Hook InputMethod into WidgetGtk and WidgetWin.

BUG=75003
TEST=views_unittests --gtest_filter=NativeTextfieldViews*

Review URL: http://codereview.chromium.org/6675005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@80226 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 12 insertions, 0 deletions

diff --git a/views/widget/native_widget.h b/views/widget/native_widget.h
index 9b28ac7..d9a1184 100644
--- a/views/widget/native_widget.h
+++ b/views/widget/native_widget.h
@@ -20,6 +20,7 @@ class OSExchangeData;
 
 namespace views {
 
+class InputMethod;
 class TooltipManager;
 class Widget;
 
@@ -81,6 +82,17 @@ class NativeWidget {
   // Returns true if this native widget is capturing all events.
   virtual bool HasMouseCapture() const = 0;
 
+  // Returns the InputMethod for this native widget.
+  // Note that all widgets in a widget hierarchy share the same input method.
+  // TODO(suzhe): rename to GetInputMethod() when NativeWidget implementation
+  // class doesn't inherit Widget anymore.
+  virtual InputMethod* GetInputMethodNative() = 0;
+
+  // Sets a different InputMethod instance to this native widget. The instance
+  // must not be initialized, the ownership will be assumed by the native
+  // widget. It's only for testing purpose.
+  virtual void ReplaceInputMethod(InputMethod* input_method) = 0;
+
  protected:
   friend class Widget;