cc: Flip textures in vertex rather than fragment shader

cc/shader.h

Index: cc/shader.h
diff --git a/cc/shader.h b/cc/shader.h
index 0d929f90f19af9a1fa20f191abee6468a66f8880..6ae060d7f2ab1ae987b54e5fa39ed65572c9da66 100644
--- a/cc/shader.h
+++ b/cc/shader.h
@@ -78,6 +78,11 @@ private:
     int m_vertexOpacityLocation;
 };
 
+class VertexShaderPosTexTransformFlip : public VertexShaderPosTexTransform {
+public:
+    std::string getShaderString() const;
+};
+
 class VertexShaderQuad {
 public:
     VertexShaderQuad();
@@ -156,11 +161,6 @@ private:
     int m_samplerLocation;
 };
 
-class FragmentShaderRGBATexFlipVaryingAlpha : public FragmentTexOpaqueBinding {
-public:
-    std::string getShaderString() const;
-};
-
 class FragmentShaderRGBATexVaryingAlpha : public FragmentTexOpaqueBinding {
 public:
     std::string getShaderString() const;
@@ -171,11 +171,6 @@ public:
     std::string getShaderString() const;
 };
 
-class FragmentShaderRGBATexRectFlipVaryingAlpha : public FragmentTexAlphaBinding {
-public:
-    std::string getShaderString() const;
-};
-
 class FragmentShaderRGBATexRectVaryingAlpha : public FragmentTexAlphaBinding {
 public:
     std::string getShaderString() const;