Hardcode scrollbar rendering for Android

cc/layer_tree_host_impl.cc

Index: cc/layer_tree_host_impl.cc
diff --git a/cc/layer_tree_host_impl.cc b/cc/layer_tree_host_impl.cc
index d1e90409007a922b5268a96b5b7f4a61af1e3151..9d8c7ba10579ed7ea228e4dbb9a0861519cd4169 100644
--- a/cc/layer_tree_host_impl.cc
+++ b/cc/layer_tree_host_impl.cc
@@ -159,6 +159,7 @@ LayerTreeHostImpl::LayerTreeHostImpl(const LayerTreeSettings& settings, LayerTre
     , m_lastSentMemoryVisibleAndNearbyBytes(0)
     , m_lastSentMemoryUseBytes(0)
     , m_animationRegistrar(AnimationRegistrar::create())
+    , m_hardcodedScrollbar(this)
 {
     DCHECK(m_proxy->isImplThread());
     didVisibilityChange(this, m_visible);
@@ -244,6 +245,7 @@ void LayerTreeHostImpl::animate(base::TimeTicks monotonicTime, base::Time wallCl
     animateScrollbars(monotonicTime);
     if (m_topControlsManager)
         m_topControlsManager->Animate(monotonicTime);
+    m_hardcodedScrollbar.Animate(monotonicTime);

[danakj, 2013/02/05 17:55:02]

why isn't this in animateScrollbars?

 }
 
 void LayerTreeHostImpl::manageTiles()
@@ -527,6 +529,8 @@ bool LayerTreeHostImpl::calculateRenderPasses(FrameData& frame)
         appendQuadsToFillScreen(frame.renderPasses.back(), rootLayer(), activeTree()->background_color(), occlusionTracker);
     }
 
+    m_hardcodedScrollbar.PrependQuads(frame.renderPasses.back());
+
     if (drawFrame)
         occlusionTracker.overdrawMetrics().recordMetrics(this);
 
@@ -1334,6 +1338,7 @@ bool LayerTreeHostImpl::scrollBy(const gfx::Point& viewportPoint,
         m_client->setNeedsCommitOnImplThread();
         m_client->setNeedsRedrawOnImplThread();
         m_client->renewTreePriority();
+        m_hardcodedScrollbar.DidUpdateScrollOffset(base::TimeTicks::Now());
     }
     return didScroll;
 }
@@ -1383,6 +1388,7 @@ void LayerTreeHostImpl::pinchGestureUpdate(float magnifyDelta, gfx::Point anchor
 
     if (rootScrollLayer()->scrollbarAnimationController())
         rootScrollLayer()->scrollbarAnimationController()->didPinchGestureUpdate(base::TimeTicks::Now());
+    m_hardcodedScrollbar.DidPinchGestureUpdate(base::TimeTicks::Now());
 
     m_client->setNeedsCommitOnImplThread();
     m_client->setNeedsRedrawOnImplThread();
@@ -1395,6 +1401,7 @@ void LayerTreeHostImpl::pinchGestureEnd()
 
     if (rootScrollLayer() && rootScrollLayer()->scrollbarAnimationController())
         rootScrollLayer()->scrollbarAnimationController()->didPinchGestureEnd(base::TimeTicks::Now());
+    m_hardcodedScrollbar.DidPinchGestureEnd(base::TimeTicks::Now());
 
     m_client->setNeedsCommitOnImplThread();
 }