Revert of Extract most of the mutable state of SkShader into a separate Context object.

include/core/SkComposeShader.h

Index: include/core/SkComposeShader.h
diff --git a/include/core/SkComposeShader.h b/include/core/SkComposeShader.h
index 9833a9f4ade275ac0fa6fa4358a5edbb5930b826..b54e5efa97e0914dab0564ed940e1f9958607b64 100644
--- a/include/core/SkComposeShader.h
+++ b/include/core/SkComposeShader.h
@@ -34,38 +34,10 @@
     SkComposeShader(SkShader* sA, SkShader* sB, SkXfermode* mode = NULL);
     virtual ~SkComposeShader();
 
-    virtual bool validContext(const SkBitmap&, const SkPaint&,
-                              const SkMatrix&, SkMatrix* totalInverse = NULL) const SK_OVERRIDE;
-    virtual SkShader::Context* createContext(const SkBitmap&, const SkPaint&,
-                                             const SkMatrix&, void*) const SK_OVERRIDE;
-    virtual size_t contextSize() const SK_OVERRIDE;
-
-    class ComposeShaderContext : public SkShader::Context {
-    public:
-        // When this object gets destroyed, it will call contextA and contextB's destructor
-        // but it will NOT free the memory.
-        ComposeShaderContext(const SkComposeShader&, const SkBitmap&,
-                             const SkPaint&, const SkMatrix&,
-                             SkShader::Context* contextA, SkShader::Context* contextB);
-
-        SkShader::Context* getShaderContextA() const { return fShaderContextA; }
-        SkShader::Context* getShaderContextB() const { return fShaderContextB; }
-
-        virtual ~ComposeShaderContext();
-
-        virtual void shadeSpan(int x, int y, SkPMColor[], int count) SK_OVERRIDE;
-
-    private:
-        SkShader::Context* fShaderContextA;
-        SkShader::Context* fShaderContextB;
-
-        typedef SkShader::Context INHERITED;
-    };
-
-#if SK_DEBUG
-    SkShader* getShaderA() { return fShaderA; }
-    SkShader* getShaderB() { return fShaderB; }
-#endif
+    virtual bool setContext(const SkBitmap&, const SkPaint&,
+                            const SkMatrix&) SK_OVERRIDE;
+    virtual void endContext() SK_OVERRIDE;
+    virtual void shadeSpan(int x, int y, SkPMColor[], int count) SK_OVERRIDE;
 
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkComposeShader)
@@ -75,6 +47,7 @@
     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
 
 private:
+
     SkShader*   fShaderA;
     SkShader*   fShaderB;
     SkXfermode* fMode;