Hide location bar on WebKit programmatic scroll.

cc/layer_tree_host.cc

Index: cc/layer_tree_host.cc
diff --git a/cc/layer_tree_host.cc b/cc/layer_tree_host.cc
index c237d1a04b6b36bd9d576389e3c6dc94f792ab3b..b982c688fb54bc82e07b0655f5ccd07257f0ce40 100644
--- a/cc/layer_tree_host.cc
+++ b/cc/layer_tree_host.cc
@@ -471,12 +471,16 @@ void LayerTreeHost::setDebugState(const LayerTreeDebugState& debugState)
 
 void LayerTreeHost::setViewportSize(const gfx::Size& layoutViewportSize, const gfx::Size& deviceViewportSize)
 {
-    if (layoutViewportSize == m_layoutViewportSize && deviceViewportSize == m_deviceViewportSize)
-        return;
+    gfx::Size mutatedDeviceViewportSize(deviceViewportSize);
+    if (m_settings.calculateTopControlsPosition)
+        mutatedDeviceViewportSize.Enlarge(0, m_settings.topControlsHeightPx);
 
+    if (layoutViewportSize == m_layoutViewportSize && mutatedDeviceViewportSize == m_deviceViewportSize)
+        return;
+  
     m_layoutViewportSize = layoutViewportSize;
-    m_deviceViewportSize = deviceViewportSize;
-
+    m_deviceViewportSize = mutatedDeviceViewportSize;
+  
     setNeedsCommit();
 }
 
@@ -491,6 +495,11 @@ void LayerTreeHost::setPageScaleFactorAndLimits(float pageScaleFactor, float min
     setNeedsCommit();
 }
 
+void LayerTreeHost::programmaticScroll(gfx::Vector2d targetOffset)
+{
+    m_proxy->programmaticScroll(targetOffset);
+}
+
 void LayerTreeHost::setVisible(bool visible)
 {
     if (m_visible == visible)