win: Drop extra triangles in triangle fan used to flip image transport surface.

ui/surface/accelerated_surface_win.cc

 // Copyright (c) 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 "ui/surface/accelerated_surface_win.h"
 
 #include <windows.h>
 #include <algorithm>
 
 #include "base/bind.h"
@@ skipping 802 matching lines @@
       { halfPixelX + 1, halfPixelY - 1, 0.5f, 1, 1, 0 },
       { halfPixelX - 1, halfPixelY - 1, 0.5f, 1, 0, 0 }
     };
 
     if (UsingOcclusionQuery()) {
       present_thread_->query()->Issue(D3DISSUE_BEGIN);
     }
 
     present_thread_->device()->BeginScene();
     present_thread_->device()->DrawPrimitiveUP(D3DPT_TRIANGLEFAN,
-                                               arraysize(vertices),
+                                               2,
                                                vertices,
                                                sizeof(vertices[0]));
     present_thread_->device()->EndScene();
 
     present_thread_->device()->SetTexture(0, NULL);
     present_thread_->device()->SetRenderTarget(0, default_render_target);
     default_render_target->Release();
   }
 
   hr = present_thread_->query()->Issue(D3DISSUE_END);
@@ skipping 62 matching lines @@
   return presenter_->CopyTo(src_subrect, dst_size, buf);
 }
 
 void AcceleratedSurface::Suspend() {
   presenter_->Suspend();
 }
 
 void AcceleratedSurface::WasHidden() {
   presenter_->WasHidden();
 }