Add class GrGLTextureRenderTarget for GL texture/rendertarget objects

BUG=skia:2889

Review URL: https://codereview.chromium.org/695813003

1 files changed, 4 insertions, 8 deletions

diff --git a/include/gpu/GrSurface.h b/include/gpu/GrSurface.h
index 9a76d3ab4f..9d891493b0 100644
--- a/include/gpu/GrSurface.h
+++ b/include/gpu/GrSurface.h
@@ -24,15 +24,11 @@ public:
 
     /**
      * Retrieves the width of the surface.
-     *
-     * @return the width in texels
      */
     int width() const { return fDesc.fWidth; }
 
     /**
      * Retrieves the height of the surface.
-     *
-     * @return the height in texels
      */
     int height() const { return fDesc.fHeight; }
 
@@ -63,14 +59,14 @@ public:
     /**
      * @return the texture associated with the surface, may be NULL.
      */
-    virtual GrTexture* asTexture() = 0;
-    virtual const GrTexture* asTexture() const = 0;
+    virtual GrTexture* asTexture() { return NULL; }
+    virtual const GrTexture* asTexture() const { return NULL; }
 
     /**
      * @return the render target underlying this surface, may be NULL.
      */
-    virtual GrRenderTarget* asRenderTarget() = 0;
-    virtual const GrRenderTarget* asRenderTarget() const = 0;
+    virtual GrRenderTarget* asRenderTarget() { return NULL; }
+    virtual const GrRenderTarget* asRenderTarget() const { return NULL; }
 
     /**
      * Reads a rectangle of pixels from the surface.