Adds local coords to GrEffect system.

src/gpu/gl/GrGLShaderBuilder.h

Index: src/gpu/gl/GrGLShaderBuilder.h
===================================================================
--- src/gpu/gl/GrGLShaderBuilder.h	(revision 8241)
+++ src/gpu/gl/GrGLShaderBuilder.h	(working copy)
@@ -80,7 +80,7 @@
         kFragment_ShaderType = 0x4,
     };
 
-    GrGLShaderBuilder(const GrGLContextInfo&, GrGLUniformManager&);
+    GrGLShaderBuilder(const GrGLContextInfo&, GrGLUniformManager&, bool explicitLocalCoords);
 
     /**
      * Called by GrGLEffects to add code to one of the shaders.
@@ -205,7 +205,17 @@
       */
     const GrGLShaderVar& positionAttribute() const { return *fPositionVar; }
 
+    /** Returns a vertex attribute that represents the local coords in the VS. This may be the same
+        as positionAttribute() or it may not be. It depends upon whether the rendering code
+        specified explicit local coords or not in the GrDrawState. */
+    const GrGLShaderVar& localCoordsAttribute() const { return *fLocalCoordsVar; }
+
     /**
+     * Are explicit local coordinates provided as input to the vertex shader.
+     */
+    bool hasExplicitLocalCoords() const { return (fLocalCoordsVar != fPositionVar); }
+
+    /**
      * Interfaces used by GrGLProgram.
      * TODO: Hide these from the GrEffects using friend or splitting this into two related classes.
      * Also, GrGLProgram's shader string construction should be moved to this class.
@@ -223,7 +233,6 @@
                                 GrBackendEffectFactory::EffectKey key,
                                 const char* fsInColor, // NULL means no incoming color
                                 const char* fsOutColor,
-                                const char* vsInCoord,
                                 SkTArray<GrGLUniformManager::UniformHandle, true>* samplerHandles);
     GrGLUniformManager::UniformHandle getRTHeightUniform() const { return fRTHeightUniform; }
 
@@ -290,6 +299,8 @@
     SkSTArray<10, AttributePair, true>  fEffectAttributes;
 
     GrGLShaderVar*                      fPositionVar;
+    GrGLShaderVar*                      fLocalCoordsVar;
+
 };
 
 #endif