Add compositor support for half-float RGBA buffers and textures

cc/output/output_surface.h

Index: cc/output/output_surface.h
diff --git a/cc/output/output_surface.h b/cc/output/output_surface.h
index 740039cbc686eef5e9cf707f85b1100d632e307f..87e4ca8d07550d7666b819fcce1e3254a54ca132 100644
--- a/cc/output/output_surface.h
+++ b/cc/output/output_surface.h
@@ -92,6 +92,9 @@ class CC_EXPORT OutputSurface {
   // Get the texture for the main image's overlay.
   virtual unsigned GetOverlayTextureId() const = 0;
 
+  // Returns true if the the surface is more than 8 bits per pixel.
+  virtual bool IsHighBitDepth() const;

[enne (OOO), 2017/02/01 23:55:22]

Maybe should also be pure virtual like the rest of the interface?

[danakj, 2017/02/02 16:23:09]

Yes please.

+
   // If this returns true, then the surface will not attempt to draw.
   virtual bool SurfaceIsSuspendForRecycle() const = 0;