Require ACK for editor-related changes not originating from browser.

content/renderer/render_widget.h

Index: content/renderer/render_widget.h
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index e5ab98921e34ca0945ec5f34f3900c3bdc96b64c..1c38ac50c958cd895602ef3d5ddf9e3cad3575f3 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -331,7 +331,22 @@ class CONTENT_EXPORT RenderWidget
 #if defined(OS_ANDROID)
   void OnImeBatchStateChanged(bool is_begin);
   void OnShowImeIfNeeded();
+  // Returns whether ordered IME processing has been enabled.

[Seigo Nonaka, 2013/07/10 02:22:17]

nit: newline between comment and next function?

[nyquist, 2013/07/12 05:55:24]

Done.

+  bool has_ordered_ime_processing() { return has_ordered_ime_processing_; }
+  // Whenever an IME event that needs an acknowledgement is sent to the browser,
+  // the number of outstanding IME events that needs acknowledgement should be
+  // incremented.
+  void IncrementOutstandingImeEventAcks();
+  // If there are outstanding IME events that needs to be acknowledged, all
+  // new IME events should be discarded. This only returns true if ordered IME
+  // processing is enabled.
+  bool HasOutstandingImeEventAcks();
+  // Called by the browser process for every required IME acknowledgement.
+  void OnImeEventAck();
 #endif
+  // Returns whether we currently should handle an IME event.
+  bool ShouldHandleImeEvent();
+
   void OnSnapshot(const gfx::Rect& src_subrect);
   void OnSetBrowserRenderingStats(const BrowserRenderingStats& stats);
 
@@ -715,6 +730,16 @@ class CONTENT_EXPORT RenderWidget
   // frame.
   ui::LatencyInfo latency_info_;
 
+#if defined(OS_ANDROID)
+  // Specifies if the ordered IME processing has been enabled.
+  bool has_ordered_ime_processing_;
+
+  // A counter for number of outstanding messages from the renderer to the
+  // browser regarding IME-type events that have not been acknowledged by the
+  // browser.
+  int outstanding_ime_acks_;
+#endif
+
   base::WeakPtrFactory<RenderWidget> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);