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 e2cecda52b6bae89b923f1999bb95ce57ae37b5d..3c3bd8052329a72e2e5e28a6d9b395c2524a1092 100644
--- a/cc/layer_tree_host.cc
+++ b/cc/layer_tree_host.cc
@@ -103,6 +103,7 @@ LayerTreeSettings::LayerTreeSettings()
     , pageScalePinchZoomEnabled(false)
     , backgroundColorInsteadOfCheckerboard(false)
     , showOverdrawInTracing(false)
+    , canUseLCDText(true)
     , refreshRate(0)
     , maxPartialTextureUpdates(std::numeric_limits<size_t>::max())
     , numRasterThreads(1)
@@ -116,6 +117,12 @@ 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);
@@ -681,7 +688,7 @@ 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.