Chromium support for window.webkitRequestAnimationFrame()

This is a very simple scheduler that targets 100fps.

BUG=64848
TEST=layout tests

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=71909

Review URL: http://codereview.chromium.org/6136005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72230 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 34 insertions, 3 deletions

diff --git a/chrome/renderer/render_widget.cc b/chrome/renderer/render_widget.cc
index 9f73dc0..8fb1d55 100644
--- a/chrome/renderer/render_widget.cc
+++ b/chrome/renderer/render_widget.cc
@@ -76,7 +76,8 @@ RenderWidget::RenderWidget(RenderThreadBase* render_thread,
       popup_type_(popup_type),
       pending_window_rect_count_(0),
       suppress_next_char_events_(false),
-      is_accelerated_compositing_active_(false) {
+      is_accelerated_compositing_active_(false),
+      animation_update_pending_(false) {
   RenderProcess::current()->AddRefProcess();
   DCHECK(render_thread_);
 }
@@ -486,9 +487,16 @@ void RenderWidget::CallDoDeferredUpdate() {
     Send(pending_input_event_ack_.release());
 }
 
+void RenderWidget::UpdateAnimationsIfNeeded() {
+  if (!is_hidden() && animation_update_pending_ &&
+      base::Time::Now() > animation_floor_time_) {
+    animation_update_pending_ = false;
+    webwidget_->animate();
+  }
+}
+
 void RenderWidget::DoDeferredUpdate() {
-  if (!webwidget_ || !paint_aggregator_.HasPendingUpdate() ||
-      update_reply_pending())
+  if (!webwidget_ || update_reply_pending())
     return;
 
   // Suppress updating when we are hidden.
@@ -498,11 +506,19 @@ void RenderWidget::DoDeferredUpdate() {
     return;
   }
 
+  if (base::Time::Now() > animation_floor_time_)
+    UpdateAnimationsIfNeeded();
+
   // Layout may generate more invalidation.  It may also enable the
   // GPU acceleration, so make sure to run layout before we send the
   // GpuRenderingActivated message.
   webwidget_->layout();
 
+  // Suppress painting if nothing is dirty.  This has to be done after updating
+  // animations running layout as these may generate further invalidations.
+  if (!paint_aggregator_.HasPendingUpdate())
+    return;
+
   // OK, save the pending update to a local since painting may cause more
   // invalidation.  Some WebCore rendering objects only layout when painted.
   PaintAggregator::PendingUpdate update;
@@ -684,6 +700,16 @@ void RenderWidget::scheduleComposite() {
   didInvalidateRect(WebRect(0, 0, 1, 1));
 }
 
+void RenderWidget::scheduleAnimation() {
+    if (!animation_update_pending_) {
+      animation_update_pending_ = true;
+      animation_floor_time_ =
+          base::Time::Now() + base::TimeDelta::FromMilliseconds(10);
+      MessageLoop::current()->PostDelayedTask(FROM_HERE, NewRunnableMethod(
+          this, &RenderWidget::UpdateAnimationsIfNeeded), 10);
+    }
+}
+
 void RenderWidget::didChangeCursor(const WebCursorInfo& cursor_info) {
   // TODO(darin): Eliminate this temporary.
   WebCursor cursor(cursor_info);
diff --git a/chrome/renderer/render_widget.h b/chrome/renderer/render_widget.h
index 71a065e..a76623f 100644
--- a/chrome/renderer/render_widget.h
+++ b/chrome/renderer/render_widget.h
@@ -102,6 +102,7 @@ class RenderWidget : public IPC::Channel::Listener,
   virtual void didScrollRect(int dx, int dy, const WebKit::WebRect& clipRect);
   virtual void didActivateAcceleratedCompositing(bool active);
   virtual void scheduleComposite();
+  virtual void scheduleAnimation();
   virtual void didFocus();
   virtual void didBlur();
   virtual void didChangeCursor(const WebKit::WebCursorInfo&);
@@ -159,6 +160,7 @@ class RenderWidget : public IPC::Channel::Listener,
   void PaintDebugBorder(const gfx::Rect& rect, skia::PlatformCanvas* canvas);
 
   void CallDoDeferredUpdate();
+  void UpdateAnimationsIfNeeded();
   void DoDeferredUpdate();
   void DoDeferredClose();
   void DoDeferredSetWindowRect(const WebKit::WebRect& pos);
@@ -368,6 +370,9 @@ class RenderWidget : public IPC::Channel::Listener,
   // compositor.
   bool is_accelerated_compositing_active_;
 
+  base::Time animation_floor_time_;
+  bool animation_update_pending_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };