Disable region copy on ARM since it isn't supported

content/browser/compositor/buffer_queue.cc

Index: content/browser/compositor/buffer_queue.cc
diff --git a/content/browser/compositor/buffer_queue.cc b/content/browser/compositor/buffer_queue.cc
index 4845e57916e9997020048c916e9e142fff305afc..6f4a19dae34a42d5b73e8dbd6480ffe5f53157c5 100644
--- a/content/browser/compositor/buffer_queue.cc
+++ b/content/browser/compositor/buffer_queue.cc
@@ -14,6 +14,7 @@
 #include "third_party/skia/include/core/SkRect.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "ui/gfx/gpu_memory_buffer.h"
+#include "ui/gfx/skia_util.h"
 
 namespace content {
 
@@ -61,12 +62,18 @@ void BufferQueue::CopyBufferDamage(int texture,
                                    int source_texture,
                                    const gfx::Rect& new_damage,
                                    const gfx::Rect& old_damage) {
+  gfx::Rect new_damage_mutable = new_damage;
+  gfx::Rect old_damage_mutable = old_damage;
+#if defined(ARCH_CPU_ARM_FAMILY)
+  // TODO(dnicoara): Remove ARM workaround once partial swap is enabled.
+  new_damage_mutable = gfx::Rect(size_);
+  old_damage_mutable = gfx::Rect();
+#endif
+
   gl_helper_->CopySubBufferDamage(
       texture_target_, texture, source_texture,
-      SkRegion(SkIRect::MakeXYWH(new_damage.x(), new_damage.y(),
-                                 new_damage.width(), new_damage.height())),
-      SkRegion(SkIRect::MakeXYWH(old_damage.x(), old_damage.y(),
-                                 old_damage.width(), old_damage.height())));
+      SkRegion(gfx::RectToSkIRect(new_damage_mutable)),
+      SkRegion(gfx::RectToSkIRect(old_damage_mutable)));
 }
 
 void BufferQueue::UpdateBufferDamage(const gfx::Rect& damage) {