content: Fix lost context handling when using native GpuMemoryBuffers.

content/browser/compositor/buffer_queue_unittest.cc

 // 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.
 
 #include <set>
 
 #include "cc/test/test_context_provider.h"
 #include "cc/test/test_web_graphics_context_3d.h"
 #include "content/browser/compositor/buffer_queue.h"
 #include "content/browser/compositor/gpu_surfaceless_browser_compositor_output_surface.h"
@@ skipping 24 matching lines @@
   gfx::GpuMemoryBufferHandle GetHandle() const override {
     return gfx::GpuMemoryBufferHandle();
   }
   ClientBuffer AsClientBuffer() override {
     return reinterpret_cast<ClientBuffer>(this);
   }
 };
 
 class StubBrowserGpuMemoryBufferManager : public BrowserGpuMemoryBufferManager {
  public:
-  StubBrowserGpuMemoryBufferManager()
-      : BrowserGpuMemoryBufferManager(nullptr, 1) {}
+  StubBrowserGpuMemoryBufferManager() : BrowserGpuMemoryBufferManager(1) {}
 
   scoped_ptr<gfx::GpuMemoryBuffer> AllocateGpuMemoryBufferForScanout(
       const gfx::Size& size,
       gfx::GpuMemoryBuffer::Format format,
       int32 surface_id) override {
     return make_scoped_ptr<gfx::GpuMemoryBuffer>(new StubGpuMemoryBufferImpl);
   }
 };
 
 class MockBufferQueue : public BufferQueue {
@@ skipping 480 matching lines @@
   // All free buffers should be destroyed, the remaining buffers should all
   // be replaced but still valid.
   EXPECT_EQ(1U, in_flight_surfaces().size());
   EXPECT_EQ(0U, available_surfaces().size());
   EXPECT_TRUE(displayed_frame().texture);
   EXPECT_TRUE(current_frame().texture);
 }
 
 }  // namespace
 }  // namespace content