skia: Add support for CHROMIUM_image backed textures.

include/core/SkSurface.h

Index: include/core/SkSurface.h
diff --git a/include/core/SkSurface.h b/include/core/SkSurface.h
index 57527ed33afa1640c44755737f48cd514fb913d5..c94609ca1ce64d6e07ab495978195ba3893e8d10 100644
--- a/include/core/SkSurface.h
+++ b/include/core/SkSurface.h
@@ -113,12 +113,14 @@ public:
     /**
      *  Return a new surface whose contents will be drawn to an offscreen
      *  render target, allocated by the surface.
+     *
+     *  |customAllocator|, if present, must be an instance of TextureStorageAllocator.
      */
     static SkSurface* NewRenderTarget(GrContext*, Budgeted, const SkImageInfo&, int sampleCount,
-                                      const SkSurfaceProps* = NULL);
+                                      const SkSurfaceProps* = NULL, void* customAllocator = NULL);

[erikchen, 2016/01/26 18:36:16]

I wasn't sure what type of interface you wanted. I could add a member to
SkSurfaceProps, or I could create another Abstract base class in SkTypes, which
the GrType allocator inherits from. Or I could just pass around a void*. Your
call.

[bsalomon, 2016/01/26 22:20:54]

Why not just pass GrTextureStorageAllocator* here?

[erikchen, 2016/01/27 21:55:14]

Oops, fixed.

 
     static SkSurface* NewRenderTarget(GrContext* gr, Budgeted b, const SkImageInfo& info) {
-        return NewRenderTarget(gr, b, info, 0, NULL);
+        return NewRenderTarget(gr, b, info, 0, NULL, NULL);
     }
 
     int width() const { return fWidth; }