Skip drawing the background (glClear) if the tiles cover it.

bug:5631590

Change-Id: Ic7dc0dac0d7f98fb94eb2b111b3e59a0a7010caf

1 files changed, 12 insertions, 0 deletions

diff --git a/Source/WebCore/platform/graphics/android/rendering/Surface.cpp b/Source/WebCore/platform/graphics/android/rendering/Surface.cpp
index 3ed3aad..f0d9e58 100644
--- a/Source/WebCore/platform/graphics/android/rendering/Surface.cpp
+++ b/Source/WebCore/platform/graphics/android/rendering/Surface.cpp
@@ -30,6 +30,7 @@
 #include "Surface.h"
 
 #include "AndroidLog.h"
+#include "BaseLayerAndroid.h"
 #include "ClassTracker.h"
 #include "LayerAndroid.h"
 #include "GLWebViewState.h"
@@ -140,6 +141,9 @@ void Surface::addLayer(LayerAndroid* layer, const TransformationMatrix& transfor
               m_unclippedArea.x(), m_unclippedArea.y(),
               m_unclippedArea.width(), m_unclippedArea.height());
     }
+
+    if (isBase())
+        m_background = static_cast<BaseLayerAndroid*>(layer)->getBackgroundColor();
 }
 
 IntRect Surface::visibleArea()
@@ -250,6 +254,14 @@ bool Surface::isReady()
     return m_surfaceBacking->isReady();
 }
 
+bool Surface::isMissingContent()
+{
+    if (!m_surfaceBacking)
+        return true;
+
+    return m_surfaceBacking->isMissingContent();
+}
+
 IntRect Surface::computePrepareArea() {
     IntRect area;