cc: Make OutputSurfaceFrame::sub_buffer_rect optional

cc/test/fake_output_surface.h

 // 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.
 
 #ifndef CC_TEST_FAKE_OUTPUT_SURFACE_H_
 #define CC_TEST_FAKE_OUTPUT_SURFACE_H_
 
 #include <stddef.h>
 
 #include "base/callback.h"
@@ skipping 75 matching lines @@
   }
 
   void set_has_external_stencil_test(bool has_test) {
     has_external_stencil_test_ = has_test;
   }
 
   void set_suspended_for_recycle(bool suspended) {
     suspended_for_recycle_ = suspended;
   }
 
-  gfx::Rect last_swap_rect() const {
-    DCHECK(last_swap_rect_valid_);
-    return last_swap_rect_;
-  }
-
   const gfx::ColorSpace& last_reshape_color_space() {
     return last_reshape_color_space_;
   }
 
  protected:
   explicit FakeOutputSurface(scoped_refptr<ContextProvider> context_provider);
   explicit FakeOutputSurface(
       std::unique_ptr<SoftwareOutputDevice> software_device);
 
   OutputSurfaceClient* client_ = nullptr;
   std::unique_ptr<OutputSurfaceFrame> last_sent_frame_;
   size_t num_sent_frames_ = 0;
   bool has_external_stencil_test_ = false;
   bool suspended_for_recycle_ = false;
   GLint framebuffer_ = 0;
   GLenum framebuffer_format_ = 0;
   OverlayCandidateValidator* overlay_candidate_validator_ = nullptr;
-  bool last_swap_rect_valid_ = false;
-  gfx::Rect last_swap_rect_;
   gfx::ColorSpace last_reshape_color_space_;
 
  private:
   void SwapBuffersAck();
 
   base::WeakPtrFactory<FakeOutputSurface> weak_ptr_factory_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_OUTPUT_SURFACE_H_