Blend TextureLayer background-color at draw time.

cc/output/gl_renderer.h

Index: cc/output/gl_renderer.h
diff --git a/cc/output/gl_renderer.h b/cc/output/gl_renderer.h
index d0b509a187e3f4cd6feefbf62bac1ac2e6e467c9..2ebc43d63004daffc53735d157d8a50a21909e95 100644
--- a/cc/output/gl_renderer.h
+++ b/cc/output/gl_renderer.h
@@ -259,6 +259,12 @@ class CC_EXPORT GLRenderer : public DirectRenderer {
                          FragmentShaderRGBATexPremultiplyAlpha>
       NonPremultipliedTextureProgram;
   typedef ProgramBinding<VertexShaderPosTexTransform,
+                         FragmentShaderTexBackgroundVaryingAlpha>
+      TextureBackgroundProgram;
+  typedef ProgramBinding<VertexShaderPosTexTransform,
+                         FragmentShaderTexBackgroundVaryingAlpha>
+      NonPremultipliedTextureBackgroundProgram;
+  typedef ProgramBinding<VertexShaderPosTexTransform,
                          FragmentShaderRGBATexRectVaryingAlpha>
       TextureIOSurfaceProgram;
 
@@ -333,6 +339,10 @@ class CC_EXPORT GLRenderer : public DirectRenderer {
       TexCoordPrecision precision);
   const NonPremultipliedTextureProgram* GetNonPremultipliedTextureProgram(
       TexCoordPrecision precision);
+  const TextureBackgroundProgram* GetTextureBackgroundProgram(
+      TexCoordPrecision precision);
+  const NonPremultipliedTextureBackgroundProgram*
+      GetNonPremultipliedTextureBackgroundProgram(TexCoordPrecision precision);
   const TextureIOSurfaceProgram* GetTextureIOSurfaceProgram(
       TexCoordPrecision precision);
 
@@ -364,11 +374,17 @@ class CC_EXPORT GLRenderer : public DirectRenderer {
 
   scoped_ptr<TextureProgram> texture_program_;
   scoped_ptr<NonPremultipliedTextureProgram> nonpremultiplied_texture_program_;
+  scoped_ptr<TextureBackgroundProgram> texture_background_program_;
+  scoped_ptr<NonPremultipliedTextureBackgroundProgram>
+      nonpremultiplied_texture_background_program_;
   scoped_ptr<TextureIOSurfaceProgram> texture_io_surface_program_;
 
   scoped_ptr<TextureProgram> texture_program_highp_;
   scoped_ptr<NonPremultipliedTextureProgram>
       nonpremultiplied_texture_program_highp_;
+  scoped_ptr<TextureBackgroundProgram> texture_background_program_highp_;
+  scoped_ptr<NonPremultipliedTextureBackgroundProgram>
+      nonpremultiplied_texture_background_program_highp_;
   scoped_ptr<TextureIOSurfaceProgram> texture_io_surface_program_highp_;
 
   scoped_ptr<RenderPassProgram> render_pass_program_;