toggle FPS counter in compositor

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 7c23e0ac64e4711192bc3c62ad80789ac3df3a23..75b16ec36edb0a2cde40ff6823e56d43246a5730 100644
--- a/cc/layer_tree_host_impl.cc
+++ b/cc/layer_tree_host_impl.cc
@@ -232,6 +232,7 @@ CCLayerTreeHostImpl::CCLayerTreeHostImpl(const CCLayerTreeSettings& settings, CC
     , m_debugRectHistory(CCDebugRectHistory::create())
     , m_numImplThreadScrolls(0)
     , m_numMainThreadScrolls(0)
+    , m_showFPSCounter(false)
 {
     ASSERT(CCProxy::isImplThread());
     didVisibilityChange(this, m_visible);
@@ -1459,4 +1460,14 @@ void CCLayerTreeHostImpl::animateScrollbarsRecursive(CCLayerImpl* layer, double
         animateScrollbarsRecursive(layer->children()[i], monotonicTime);
 }
 
+void CCLayerTreeHostImpl::setShowFPSCounter(bool show)
+{
+    m_showFPSCounter = show;
+}
+
+bool CCLayerTreeHostImpl::showFPSCounter() const
+{
+    return m_showFPSCounter;
+}
+
 }  // namespace cc