Standardize IME callbacks for off-screen rendering (issue #1675)

tests/cefclient/browser/osr_window_win.h

@@ -16,6 +16,8 @@
 
 namespace client {
 
+class OsrImeHandlerWin;
+
 // Represents the native parent window for an off-screen browser. This object
 // must live on the CEF UI thread in order to handle CefRenderHandler callbacks.
 // The methods of this class are thread-safe unless otherwise indicated.
@@ -94,6 +96,11 @@ class OsrWindowWin :
   void OnPaint();
   bool OnEraseBkgnd();
 
+  void OnIMESetContext(UINT message, WPARAM wParam, LPARAM lParam);
+  void OnIMEStartComposition();
+  void OnIMEComposition(UINT message, WPARAM wParam, LPARAM lParam);
+  void OnIMECancelCompositionEvent();
+
   // Manage popup bounds.
   bool IsOverPopupWidget(int x, int y) const;
   int GetPopupXOffset() const;
@@ -133,6 +140,10 @@ class OsrWindowWin :
                      int x, int y) OVERRIDE;
   void UpdateDragCursor(CefRefPtr<CefBrowser> browser,
                         CefRenderHandler::DragOperation operation) OVERRIDE;
+  void OnImeCompositionRangeChanged(
+      CefRefPtr<CefBrowser> browser,
+      const CefRange& selection_range,
+      const CefRenderHandler::RectList& character_bounds) OVERRIDE;
 
 #if defined(CEF_USE_ATL)
   // OsrDragEvents methods.
@@ -156,6 +167,9 @@ class OsrWindowWin :
   HDC hdc_;
   HGLRC hrc_;
 
+  // Class that encapsulates IMM32 APIs and controls IMEs attached to a window.
+  scoped_ptr<OsrImeHandlerWin> ime_handler_;
+
   RECT client_rect_;
   float device_scale_factor_;