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..05cf13c895ed0d34955b4b6eb11f14f5454a9a5c 100644
--- a/content/browser/compositor/buffer_queue.cc
+++ b/content/browser/compositor/buffer_queue.cc
@@ -61,12 +61,20 @@ void BufferQueue::CopyBufferDamage(int texture,
                                    int source_texture,
                                    const gfx::Rect& new_damage,
                                    const gfx::Rect& old_damage) {
+  // TODO(dnicoara): Remove ARM workaround once partial swap is enabled.
+#if defined(ARCH_CPU_ARM_FAMILY)
+  gl_helper_->CopySubBufferDamage(
+      texture_target_, texture, source_texture,
+      SkRegion(SkIRect::MakeXYWH(0, 0, size_.width(), size_.height())),

[danakj, 2015/09/23 21:09:26]

nit: if i was doing this i'd share as much code as possible. something like

gfx::Rect new_damage_mutable = new_damage;
gfx::Rect old_damage_mutable = old_damage;

#if ARCH
// TODO...
new_damage_mutable = gfx::Rect(size_);
old_damage_mutable = gfx::Rect();
#endif

[dnicoara, 2015/09/23 21:23:13]

Done.

+      SkRegion(SkIRect::MakeXYWH(0, 0, 0, 0)));
+#else
   gl_helper_->CopySubBufferDamage(
       texture_target_, texture, source_texture,
       SkRegion(SkIRect::MakeXYWH(new_damage.x(), new_damage.y(),

[danakj, 2015/09/23 21:09:26]

btw.. RectToSkIRect:
https://code.google.com/p/chromium/codesearch#chromium/src/ui/gfx/skia_util.h...

[dnicoara, 2015/09/23 21:23:13]

Done. Nice, forgot about the helpers.

                                  new_damage.width(), new_damage.height())),
       SkRegion(SkIRect::MakeXYWH(old_damage.x(), old_damage.y(),
                                  old_damage.width(), old_damage.height())));
+#endif
 }
 
 void BufferQueue::UpdateBufferDamage(const gfx::Rect& damage) {