Mark layers that can use LCD text based on layer transform and opacity.

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 9194e1482797750bda1ec92c0045f3c5538373bc..7b93d78ed74d1edab3138d80205980488123e425 100644
--- a/cc/layer_tree_host.cc
+++ b/cc/layer_tree_host.cc
@@ -104,6 +104,7 @@ LayerTreeSettings::LayerTreeSettings()
     , pageScalePinchZoomEnabled(false)
     , backgroundColorInsteadOfCheckerboard(false)
     , showOverdrawInTracing(false)
+    , canUseLCDText(true)
     , refreshRate(0)
     , maxPartialTextureUpdates(std::numeric_limits<size_t>::max())
     , numRasterThreads(1)
@@ -117,6 +118,12 @@ LayerTreeSettings::LayerTreeSettings()
     backgroundColorInsteadOfCheckerboard = CommandLine::ForCurrentProcess()->HasSwitch(switches::kBackgroundColorInsteadOfCheckerboard);
     showOverdrawInTracing = CommandLine::ForCurrentProcess()->HasSwitch(switches::kTraceOverdraw);
 
+// TODO(alokp): Remove this hard-coded setting.
+// Platforms that need to disable LCD text must explicitly set this value.
+#if defined(OS_ANDROID)
+    canUseLCDText = false;
+#endif
+
     initialDebugState.showPropertyChangedRects = CommandLine::ForCurrentProcess()->HasSwitch(cc::switches::kShowPropertyChangedRects);
     initialDebugState.showSurfaceDamageRects = CommandLine::ForCurrentProcess()->HasSwitch(cc::switches::kShowSurfaceDamageRects);
     initialDebugState.showScreenSpaceRects = CommandLine::ForCurrentProcess()->HasSwitch(cc::switches::kShowScreenSpaceRects);
@@ -682,7 +689,7 @@ void LayerTreeHost::updateLayers(Layer* rootLayer, ResourceUpdateQueue& queue)
         }
 
         TRACE_EVENT0("cc", "LayerTreeHost::updateLayers::calcDrawEtc");
-        LayerTreeHostCommon::calculateDrawProperties(rootLayer, deviceViewportSize(), m_deviceScaleFactor, m_pageScaleFactor, rendererCapabilities().maxTextureSize, updateList);
+        LayerTreeHostCommon::calculateDrawProperties(rootLayer, deviceViewportSize(), m_deviceScaleFactor, m_pageScaleFactor, rendererCapabilities().maxTextureSize, m_settings.canUseLCDText, updateList);
     }
 
     // Reset partial texture update requests.