Disable region copy on ARM since it isn't supported

ui/ozone/platform/drm/gpu/drm_window_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 <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkCanvas.h"
@@ skipping 17 matching lines @@
     {0, 6, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, {'\0'}};
 
 const gfx::AcceleratedWidget kDefaultWidgetHandle = 1;
 const uint32_t kDefaultCrtc = 1;
 const uint32_t kDefaultConnector = 2;
 const int kDefaultCursorSize = 64;
 
 std::vector<skia::RefPtr<SkSurface>> GetCursorBuffers(
     const scoped_refptr<ui::MockDrmDevice> drm) {
   std::vector<skia::RefPtr<SkSurface>> cursor_buffers;
-  for (const skia::RefPtr<SkSurface>& cursor_buffer : drm->buffers()) {
+  for (const auto& cursor_buffer : drm->buffers()) {
     if (cursor_buffer->width() == kDefaultCursorSize &&
         cursor_buffer->height() == kDefaultCursorSize) {
       cursor_buffers.push_back(cursor_buffer);
     }
   }
 
   return cursor_buffers;
 }
 
 SkBitmap AllocateBitmap(const gfx::Size& size) {
@@ skipping 93 matching lines @@
   // Move window to the display on the new device.
   screen_manager_->GetWindow(kDefaultWidgetHandle)
       ->OnBoundsChanged(gfx::Rect(0, kDefaultMode.vdisplay,
                                   kDefaultMode.hdisplay,
                                   kDefaultMode.vdisplay));
 
   EXPECT_EQ(2u, GetCursorBuffers(drm).size());
   // Make sure the cursor is showing on the new display.
   EXPECT_NE(0u, drm->get_cursor_handle_for_crtc(kDefaultCrtc));
 }