cc: Remove static from leaf invalidation perf test

cc/trees/layer_tree_host_perftest.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/trees/layer_tree_host.h"
 
 #include <sstream>
 
 #include "base/file_util.h"
 #include "base/files/file_path.h"
@@ skipping 174 matching lines @@
     for (layer_to_invalidate_ = layer_tree_host()->root_layer();
          layer_to_invalidate_->children().size();
          layer_to_invalidate_ = layer_to_invalidate_->children()[0].get()) {
     }
   }
 
   virtual void DidCommitAndDrawFrame() OVERRIDE {
     if (TestEnded())
       return;
 
-    static bool flip = true;
-    layer_to_invalidate_->SetOpacity(flip ? 1.f : 0.5f);
-    flip = !flip;
+    layer_to_invalidate_->SetOpacity(
+        layer_to_invalidate_->opacity() != 1.f ? 1.f : 0.5f);
   }
 
  protected:
   Layer* layer_to_invalidate_;
 };
 
 // Simulates a tab switcher scene with two stacks of 10 tabs each. Invalidate a
 // property on a leaf layer in the tree every commit.
 TEST_F(LayerTreeHostPerfTestLeafInvalidates, TenTenSingleThread) {
   SetTestName("10_10_single_thread_leaf_invalidates");
@@ skipping 121 matching lines @@
 TEST_F(LayerTreeHostPerfTestJsonReader, HeavyPageThreadedImplSide) {
   begin_frame_driven_drawing_ = true;
   measure_commit_cost_ = true;
   SetTestName("heavy_page");
   ReadTestFile("heavy_layer_tree");
   RunTestWithImplSidePainting();
 }
 
 }  // namespace
 }  // namespace cc