Add mayHaveChangedRenderedSize callback.

content/renderer/render_view.cc

Index: content/renderer/render_view.cc
diff --git a/content/renderer/render_view.cc b/content/renderer/render_view.cc
index f7788e28394c546c85b4d89ba3f1c632265e105a..d7b52dce312dec6d9e281f921d8f501ec096ec44 100644
--- a/content/renderer/render_view.cc
+++ b/content/renderer/render_view.cc
@@ -2715,6 +2715,16 @@ void RenderView::didChangeContentsSize(WebFrame* frame, const WebSize& size) {
   CheckPreferredSize();
 }
 
+void RenderView::mayHaveChangedRenderedSize(WebFrame* frame) {
+  if (!send_preferred_size_changes_ || !webview())
+    return;
+  // If we hit this code path, then stop the deprecated timer.
+  check_preferred_size_timer_.Stop();
+  preferred_size_change_timer_.Stop();
+  preferred_size_change_timer_.Start(TimeDelta::FromMilliseconds(10), this,

[jamesr, 2011/05/24 22:53:33]

based on what base/timer.h says i think this Stop/Start() should be a Reset()

[levin, 2011/05/24 23:00:23]

Good catch. I missed that call actually, but I don't think it works in this
case.

It appears to only works if the timer is running. (Also this is called the first
time the timer is set-up.)

+                                     &RenderView::CheckPreferredSize);
+}
+
 void RenderView::CheckPreferredSize() {
   // We don't always want to send the change messages over IPC, only if we've
   // be put in that mode by getting a |ViewMsg_EnablePreferredSizeChangedMode|