Add fixed raster scale use counter histograms.

cc/trees/proxy_common.cc

Index: cc/trees/proxy_common.cc
diff --git a/cc/trees/proxy_common.cc b/cc/trees/proxy_common.cc
index c96af7b4acdbd739a29e8492061491f3b52ff6f2..05624cc09dfde81fae6c14d81d1fc63796fb5d05 100644
--- a/cc/trees/proxy_common.cc
+++ b/cc/trees/proxy_common.cc
@@ -10,7 +10,10 @@
 namespace cc {
 
 BeginMainFrameAndCommitState::BeginMainFrameAndCommitState()
-    : memory_allocation_limit_bytes(0), evicted_ui_resources(false) {}
+    : memory_allocation_limit_bytes(0),

[danakj, 2016/05/13 20:41:47]

while you're here... mind moving all this init sadness to the definitions to be
less sadness?

[vmpstr, 2016/05/13 21:17:10]

Done.

+      evicted_ui_resources(false),
+      has_fixed_raster_scale_blurry_content(false),
+      has_fixed_raster_scale_potential_performance_regression(false) {}
 
 BeginMainFrameAndCommitState::~BeginMainFrameAndCommitState() {}
 
@@ -21,6 +24,10 @@ void BeginMainFrameAndCommitState::ToProtobuf(
   scroll_info->ToProtobuf(proto->mutable_scroll_info());
   proto->set_memory_allocation_limit_bytes(memory_allocation_limit_bytes);
   proto->set_evicted_ui_resources(evicted_ui_resources);
+  proto->set_has_fixed_raster_scale_blurry_content(
+      has_fixed_raster_scale_blurry_content);
+  proto->set_has_fixed_raster_scale_potential_performance_regression(
+      has_fixed_raster_scale_potential_performance_regression);
 }
 
 void BeginMainFrameAndCommitState::FromProtobuf(
@@ -31,6 +38,10 @@ void BeginMainFrameAndCommitState::FromProtobuf(
   scroll_info->FromProtobuf(proto.scroll_info());
   memory_allocation_limit_bytes = proto.memory_allocation_limit_bytes();
   evicted_ui_resources = proto.evicted_ui_resources();
+  has_fixed_raster_scale_blurry_content =
+      proto.has_fixed_raster_scale_blurry_content();
+  has_fixed_raster_scale_potential_performance_regression =
+      proto.has_fixed_raster_scale_potential_performance_regression();
 }
 
 }  // namespace cc