cc:: Add RenderingStatsInstrumentation to manage collection of RenderingStats

This change adds the class RenderingStatsInstrumentation that manages conditional
saving and thread-specific access to a private RenderingStats instance.
An instance of RenderingStatsRecorder is created on LayerTreeHost, which
passes references to LayerTreeHostImpl and TileManager. Access to reading
and writing on the internal RenderingStats instance is guarded by a lock.

All rendering stats saving in LayerTreeHost, Single-/ThreadProxy,
LayerTreeHostImpl and TileManager has been switched to use the
RenderingStatsInstrumentation. Stats collection within Layer::update() still
follows the original structure to keep this change small.

BUG=181319
NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=189475

Review URL: https://chromiumcodereview.appspot.com/12519006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@189621 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 10 insertions, 2 deletions

diff --git a/cc/test/fake_layer_tree_host_impl.cc b/cc/test/fake_layer_tree_host_impl.cc
index 334ff9f..f393f1d 100644
--- a/cc/test/fake_layer_tree_host_impl.cc
+++ b/cc/test/fake_layer_tree_host_impl.cc
@@ -7,7 +7,11 @@
 namespace cc {
 
 FakeLayerTreeHostImpl::FakeLayerTreeHostImpl(Proxy* proxy)
-    : LayerTreeHostImpl(LayerTreeSettings(), &client_, proxy) {
+    : LayerTreeHostImpl(LayerTreeSettings(),
+                        &client_,
+                        proxy,
+                        &stats_instrumentation_)
+{
   // Explicitly clear all debug settings.
   SetDebugState(LayerTreeDebugState());
 }
@@ -15,7 +19,11 @@ FakeLayerTreeHostImpl::FakeLayerTreeHostImpl(Proxy* proxy)
 FakeLayerTreeHostImpl::FakeLayerTreeHostImpl(
     const LayerTreeSettings& settings,
     Proxy* proxy)
-    : LayerTreeHostImpl(settings, &client_, proxy) {
+    : LayerTreeHostImpl(settings,
+                        &client_,
+                        proxy,
+                        &stats_instrumentation_)
+{
   // Explicitly clear all debug settings.
   SetDebugState(LayerTreeDebugState());
 }