DO NOT SUBMIT: Bundle IME-related messages into one for batch edit

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 2429f629b3cf53de06c6565c8eb7470c65ec36e8..30bd3cb7895a6b3a8c17b6347c8b98d05d29d29f 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -216,6 +216,7 @@ RenderWidgetHostImpl::RenderWidgetHostImpl(RenderWidgetHostDelegate* delegate,
           RenderWidgetHostDelegate::RENDERER_UNRESPONSIVE_UNKNOWN),
       new_content_rendering_delay_(
           base::TimeDelta::FromMilliseconds(kNewContentRenderingDelayMs)),
+      in_ime_batch_edit_(false),
       weak_factory_(this) {
   CHECK(delegate_);
   CHECK_NE(MSG_ROUTING_NONE, routing_id_);
@@ -1265,6 +1266,33 @@ void RenderWidgetHostImpl::HandleCompositorProto(
   Send(new ViewMsg_HandleCompositorProto(GetRoutingID(), proto));
 }
 
+void RenderWidgetHostImpl::BeginBatchEdit() {
+  in_ime_batch_edit_ = true;
+}
+
+void RenderWidgetHostImpl::EndBatchEdit() {
+  if (!in_ime_batch_edit_)
+    return;
+  in_ime_batch_edit_ = false;
+  if (batch_edit_messages_.empty())
+    return;
+  Send(new InputMsg_ImeBatchEdit(routing_id_, batch_edit_messages_));
+  batch_edit_messages_.clear();
+}
+
+void RenderWidgetHostImpl::SendOrBatch(IPC::Message* message) {
+  if (in_ime_batch_edit_)
+    batch_edit_messages_.push_back(*message);
+  else
+    Send(message);
+}
+
+void RenderWidgetHostImpl::ExtendSelectionAndDelete(size_t before,
+                                                    size_t after) {
+  SendOrBatch(new InputMsg_ImeExtendSelectionAndDelete(
+      routing_id_, before, after));
+}
+
 void RenderWidgetHostImpl::NotifyScreenInfoChanged() {
   if (delegate_)
     delegate_->ScreenInfoChanged();
@@ -1413,7 +1441,7 @@ void RenderWidgetHostImpl::ImeSetComposition(
     const gfx::Range& replacement_range,
     int selection_start,
     int selection_end) {
-  Send(new InputMsg_ImeSetComposition(
+  SendOrBatch(new InputMsg_ImeSetComposition(
             GetRoutingID(), text, underlines, replacement_range,
             selection_start, selection_end));
 }
@@ -1422,12 +1450,12 @@ void RenderWidgetHostImpl::ImeConfirmComposition(
     const base::string16& text,
     const gfx::Range& replacement_range,
     bool keep_selection) {
-  Send(new InputMsg_ImeConfirmComposition(
+  SendOrBatch(new InputMsg_ImeConfirmComposition(
         GetRoutingID(), text, replacement_range, keep_selection));
 }
 
 void RenderWidgetHostImpl::ImeCancelComposition() {
-  Send(new InputMsg_ImeSetComposition(GetRoutingID(), base::string16(),
+  SendOrBatch(new InputMsg_ImeSetComposition(GetRoutingID(), base::string16(),
             std::vector<blink::WebCompositionUnderline>(),
             gfx::Range::InvalidRange(), 0, 0));
 }