Move copy-surface-as-draw fallback to GrGLGpu.

src/gpu/gl/GrGLSL.h

Index: src/gpu/gl/GrGLSL.h
diff --git a/src/gpu/gl/GrGLSL.h b/src/gpu/gl/GrGLSL.h
index 99671c130e0c5e3a431cc5b74a0ba27f2be7594c..db8e1bdca5092a42f7524604d462c88d3b4bf9e4 100644
--- a/src/gpu/gl/GrGLSL.h
+++ b/src/gpu/gl/GrGLSL.h
@@ -57,6 +57,24 @@ bool GrGetGLSLGeneration(const GrGLInterface* gl, GrGLSLGeneration* generation);
 const char* GrGetGLSLVersionDecl(const GrGLContextInfo&);
 
 /**
+ * Adds a line of GLSL code to declare the default precision for float types.
+ */
+void GrGLSLAppendDefaultFloatPrecisionDeclaration(GrSLPrecision, GrGLStandard, SkString* out);
+
+/**
+ * Gets the name of the function that should be used to sample a 2D texture. Coord type is used
+ * to indicate whether the texture is sampled using projective textured (kVec3f) or not (kVec2f).
+ */
+inline const char* GrGLSLTexture2DFunctionName(GrSLType coordType, GrGLSLGeneration glslGen) {
+    if (kVec2f_GrSLType == coordType) {
+        return glslGen >= k130_GrGLSLGeneration ? "texture" : "texture2D";
+    } else {
+        SkASSERT(kVec3f_GrSLType == coordType);
+        return glslGen >= k130_GrGLSLGeneration ? "textureProj" : "texture2DProj";
+    }
+}
+
+/**
  * Converts a GrSLType to a string containing the name of the equivalent GLSL type.
  */
 static inline const char* GrGLSLTypeString(GrSLType t) {