[Ozone] Enables overlay render format setting path and by default use UYVY

ui/ozone/platform/cast/surface_factory_cast.cc

Index: ui/ozone/platform/cast/surface_factory_cast.cc
diff --git a/ui/ozone/platform/cast/surface_factory_cast.cc b/ui/ozone/platform/cast/surface_factory_cast.cc
index f374f0de2e040151bd24363745b67b0154efc72d..174dd78cf03f39397863b3b35b1e8fe73a647460 100644
--- a/ui/ozone/platform/cast/surface_factory_cast.cc
+++ b/ui/ozone/platform/cast/surface_factory_cast.cc
@@ -190,6 +190,9 @@ scoped_refptr<NativePixmap> SurfaceFactoryCast::CreateNativePixmap(
     }
     int GetDmaBufFd() override { return 0; }
     int GetDmaBufPitch() override { return 0; }
+    gfx::BufferFormat GetBufferFormat() override {
+      return gfx::BufferFormat::LAST;

[spang, 2015/11/10 15:46:18]

LAST doesn't really make sense since it will change as new types are added.
Probably just BGRA_8888.

[william.xie1, 2015/11/10 16:07:56]

Done.

+    }
     bool ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
                               int plane_z_order,
                               gfx::OverlayTransform plane_transform,
@@ -197,8 +200,11 @@ scoped_refptr<NativePixmap> SurfaceFactoryCast::CreateNativePixmap(
                               const gfx::RectF& crop_rect) override {
       return true;
     }
-    void SetScalingCallback(const ScalingCallback& scaling_callback) override {}
-    scoped_refptr<NativePixmap> GetScaledPixmap(gfx::Size new_size) override {
+    void SetProcessingCallback(
+        const ProcessingCallback& processing_callback) override {}
+    scoped_refptr<NativePixmap> GetProcessedPixmap(
+        gfx::Size target_size,
+        gfx::BufferFormat target_format) override {
       return nullptr;
     }
     gfx::NativePixmapHandle ExportHandle() override {