Plumbing for browser process to access text surrounding selection.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index a667a599dfde75a133593dc62e50a5e355ace9f4..aed279e0a93170858190c862dd293d8ab3aa7b5c 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -705,10 +705,12 @@ bool RenderFrameImpl::OnMessageReceived(const IPC::Message& msg) {
                         OnSetCompositionFromExistingText)
     IPC_MESSAGE_HANDLER(FrameMsg_ExtendSelectionAndDelete,
                         OnExtendSelectionAndDelete)
+    IPC_MESSAGE_HANDLER(FrameMsg_Reload, OnReload)
+    IPC_MESSAGE_HANDLER(FrameMsg_TextSurroundingSelectionRequest,
+                        OnTextSurroundingSelectionRequest)
 #if defined(OS_MACOSX)
     IPC_MESSAGE_HANDLER(InputMsg_CopyToFindPboard, OnCopyToFindPboard)
 #endif
-    IPC_MESSAGE_HANDLER(FrameMsg_Reload, OnReload)
   IPC_END_MESSAGE_MAP()
 
   return handled;
@@ -1187,11 +1189,19 @@ void RenderFrameImpl::OnExtendSelectionAndDelete(int before, int after) {
   frame_->extendSelectionAndDelete(before, after);
 }
 
-
 void RenderFrameImpl::OnReload(bool ignore_cache) {
   frame_->reload(ignore_cache);
 }
 
+void RenderFrameImpl::OnTextSurroundingSelectionRequest(unsigned max_length) {
+  unsigned start_offset, end_offset;
+  base::string16 content =
+      frame_->textSurroundingSelection(max_length, &start_offset, &end_offset);
+
+  Send(new FrameHostMsg_TextSurroundingSelectionResponse(
+      routing_id_, content, start_offset, end_offset));
+}
+
 bool RenderFrameImpl::ShouldUpdateSelectionTextFromContextMenuParams(
     const base::string16& selection_text,
     size_t selection_text_offset,