Add a BrowserViewRenderer unittest for compositor switch logic

content/public/test/test_synchronous_compositor_android.h

 // Copyright 2014 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.
 
 #ifndef CONTENT_PUBLIC_TEST_TEST_SYNCHRONOUS_COMPOSITOR_ANDROID_H_
 #define CONTENT_PUBLIC_TEST_TEST_SYNCHRONOUS_COMPOSITOR_ANDROID_H_
 
 #include <stddef.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "cc/output/compositor_frame_ack.h"
 #include "content/public/browser/android/synchronous_compositor.h"
 #include "content/public/browser/android/synchronous_compositor_client.h"
 
 namespace content {
 
 class CONTENT_EXPORT TestSynchronousCompositor : public SynchronousCompositor {
  public:
-  TestSynchronousCompositor();
+  TestSynchronousCompositor(int process_id, int routing_id);
   ~TestSynchronousCompositor() override;
 
   void SetClient(SynchronousCompositorClient* client);
 
   // SynchronousCompositor overrides.
   SynchronousCompositor::Frame DemandDrawHw(
       const gfx::Size& surface_size,
       const gfx::Transform& transform,
       const gfx::Rect& viewport,
       const gfx::Rect& clip,
@@ skipping 18 matching lines @@
     ~ReturnedResources();
 
     uint32_t output_surface_id;
     cc::ReturnedResourceArray resources;
   };
   using FrameAckArray = std::vector<ReturnedResources>;
   void SwapReturnedResources(FrameAckArray* array);
 
  private:
   SynchronousCompositorClient* client_;
+  const int process_id_;
+  const int routing_id_;
   SynchronousCompositor::Frame hardware_frame_;
   FrameAckArray frame_ack_array_;
 
   DISALLOW_COPY_AND_ASSIGN(TestSynchronousCompositor);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_TEST_SYNCHRONOUS_COMPOSITOR_ANDROID_H_