Introduction of set of functions to manage generation of texture fetch shader code.  

A new set of routines have been added to GrGLShaderBuilder to emit texture fetches, taking into consideration the format of the texture to be accessed, and the channel swizzle.  
Review URL: https://codereview.appspot.com/6446072

git-svn-id: http://skia.googlecode.com/svn/trunk@4919 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/effects/gradients/SkTwoPointConicalGradient.cpp b/src/effects/gradients/SkTwoPointConicalGradient.cpp
index 9fe180a..8902573 100644
--- a/src/effects/gradients/SkTwoPointConicalGradient.cpp
+++ b/src/effects/gradients/SkTwoPointConicalGradient.cpp
@@ -340,7 +340,7 @@
                          const GrRenderTarget*,
                          int stageNum) SK_OVERRIDE;
 
-    static StageKey GenKey(const GrCustomStage& s);
+    static StageKey GenKey(const GrCustomStage& s, const GrGLCaps& caps);
 
 protected:
 
@@ -636,7 +636,7 @@
     }
 }
 
-GrCustomStage::StageKey GrGLConical2Gradient::GenKey(const GrCustomStage& s) {
+GrCustomStage::StageKey GrGLConical2Gradient::GenKey(const GrCustomStage& s, const GrGLCaps& caps) {
     return (static_cast<const GrConical2Gradient&>(s).isDegenerate());
 }
 
@@ -669,4 +669,4 @@
     return NULL;
 }
 
-#endif
\ No newline at end of file
+#endif