Update Mac plugin IME handling to match updated spec

chrome/browser/renderer_host/render_widget_host_view_mac.h

Index: chrome/browser/renderer_host/render_widget_host_view_mac.h
diff --git a/chrome/browser/renderer_host/render_widget_host_view_mac.h b/chrome/browser/renderer_host/render_widget_host_view_mac.h
index 0ddfbbab5b4c39f518c095960a1c6087334ead98..7b18f5cf4d1653d7b7c84f60948860627a409b77 100644
--- a/chrome/browser/renderer_host/render_widget_host_view_mac.h
+++ b/chrome/browser/renderer_host/render_widget_host_view_mac.h
@@ -120,8 +120,11 @@ class RWHVMEditCommandHelper;
   // etc.
   EditCommands editCommands_;
 
-  // The plugin for which IME is currently enabled (-1 if not enabled).
-  int pluginImeIdentifier_;
+  // The plugin that currently has focus (-1 if no plugin has focus).
+  int focusedPluginIdentifier_;
+
+  // Whether or not plugin IME is currently enabled active.
+  BOOL pluginImeActive_;
 }
 
 @property(assign, nonatomic) NSRect caretRect;
@@ -141,8 +144,10 @@ class RWHVMEditCommandHelper;
 - (void)cancelComposition;
 // Confirm ongoing composition.
 - (void)confirmComposition;
-// Enables or disables plugin IME for the given plugin.
-- (void)setPluginImeEnabled:(BOOL)enabled forPlugin:(int)pluginId;
+// Enables or disables plugin IME.
+- (void)setPluginImeActive:(BOOL)active;
+// Updates the current plugin focus state.
+- (void)pluginFocusChanged:(BOOL)focused forPlugin:(int)pluginId;
 // Evaluates the event in the context of plugin IME, if plugin IME is enabled.
 // Returns YES if the event was handled.
 - (BOOL)postProcessEventForPluginIme:(NSEvent*)event;
@@ -219,7 +224,8 @@ class RenderWidgetHostViewMac : public RenderWidgetHostView {
   virtual void OnAccessibilityNotifications(
       const std::vector<ViewHostMsg_AccessibilityNotification_Params>& params);
 
-  virtual void SetPluginImeEnabled(bool enabled, int plugin_id);
+  virtual void PluginFocusChanged(bool focused, int plugin_id);
+  virtual void StartPluginIme();
   virtual bool PostProcessEventForPluginIme(
       const NativeWebKeyboardEvent& event);
 
@@ -269,8 +275,8 @@ class RenderWidgetHostViewMac : public RenderWidgetHostView {
 
   void SetTextInputActive(bool active);
 
-  // Sends confirmed plugin IME text back to the renderer.
-  void PluginImeCompositionConfirmed(const string16& text, int plugin_id);
+  // Sends completed plugin IME notification and text back to the renderer.
+  void PluginImeCompositionCompleted(const string16& text, int plugin_id);
 
   const std::string& selected_text() const { return selected_text_; }