Use highp for gpu bezier effects

src/gpu/gl/builders/GrGLShaderBuilder.h

Index: src/gpu/gl/builders/GrGLShaderBuilder.h
diff --git a/src/gpu/gl/builders/GrGLShaderBuilder.h b/src/gpu/gl/builders/GrGLShaderBuilder.h
index 1d0fa6a7906d9d01b902b94895d501b9ee5f6617..ffb324773a8be4f3776f602a06b331c6851ebf21 100644
--- a/src/gpu/gl/builders/GrGLShaderBuilder.h
+++ b/src/gpu/gl/builders/GrGLShaderBuilder.h
@@ -94,6 +94,11 @@ public:
        va_end(args);
     }
 
+    /**
+     * Appends a variable declaration to one of the shaders
+     */
+    void declAppend(const GrGLShaderVar& var);
+
     /** Emits a helper function outside of main() in the fragment shader. */
     void emitFunction(GrSLType returnType,
                       const char* name,