- Reduce CPU usage with requestAnimationFrame by maintaining a consistent 60fps frame rate (issue #456).

- (Win) Reduce memory/CPU usage with UpdateInputMethod by restricting tasks to every 100ms (issue #454).

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@423 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/webwidget_host_gtk.cc

@@ -302,7 +302,7 @@ void WebWidgetHost::DidScrollRect(int dx, int dy, const gfx::Rect& clip_rect) {
   DidInvalidateRect(clip_rect);
 }
 
-void WebWidgetHost::ScheduleComposite() {
+void WebWidgetHost::Invalidate() {
   int width = logical_size_.width();
   int height = logical_size_.height();
   GdkRectangle grect = {
@@ -323,6 +323,7 @@ WebWidgetHost::WebWidgetHost()
       canvas_h_(0),
       popup_(false),
       has_update_task_(false),
+      has_invalidate_task_(false),
       ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)) {
   set_painting(false);
 }
@@ -414,6 +415,11 @@ void WebWidgetHost::Paint() {
   cairo_destroy(cairo_drawable);
 
   gdk_window_end_paint(window);
+
+  // Used with scheduled invalidation to maintain a consistent frame rate.
+  paint_last_call_ = base::TimeTicks::Now();
+  if (has_invalidate_task_)
+    has_invalidate_task_ = false;
 }
 
 void WebWidgetHost::SetTooltipText(const CefString& tooltip_text)