Remove kDefault_GrSurfaceOrigin

Change-Id: Ic55d488287add32e5a32b5a77415e16cebf4c1ee
Reviewed-on: https://skia-review.googlesource.com/29120
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/glsl/GrGLSLFragmentShaderBuilder.cpp b/src/gpu/glsl/GrGLSLFragmentShaderBuilder.cpp
index afbfa09..7e6b8f7 100644
--- a/src/gpu/glsl/GrGLSLFragmentShaderBuilder.cpp
+++ b/src/gpu/glsl/GrGLSLFragmentShaderBuilder.cpp
@@ -72,10 +72,10 @@
 
 uint8_t GrGLSLFragmentShaderBuilder::KeyForSurfaceOrigin(GrSurfaceOrigin origin) {
     SkASSERT(kTopLeft_GrSurfaceOrigin == origin || kBottomLeft_GrSurfaceOrigin == origin);
-    return origin;
+    return origin + 1;
 
-    GR_STATIC_ASSERT(1 == kTopLeft_GrSurfaceOrigin);
-    GR_STATIC_ASSERT(2 == kBottomLeft_GrSurfaceOrigin);
+    GR_STATIC_ASSERT(0 == kTopLeft_GrSurfaceOrigin);
+    GR_STATIC_ASSERT(1 == kBottomLeft_GrSurfaceOrigin);
 }
 
 GrGLSLFragmentShaderBuilder::GrGLSLFragmentShaderBuilder(GrGLSLProgramBuilder* program)
@@ -272,10 +272,10 @@
 
 GrSurfaceOrigin GrGLSLFragmentShaderBuilder::getSurfaceOrigin() const {
     SkASSERT(fProgramBuilder->header().fSurfaceOriginKey);
-    return static_cast<GrSurfaceOrigin>(fProgramBuilder->header().fSurfaceOriginKey);
+    return static_cast<GrSurfaceOrigin>(fProgramBuilder->header().fSurfaceOriginKey-1);
 
-    GR_STATIC_ASSERT(1 == kTopLeft_GrSurfaceOrigin);
-    GR_STATIC_ASSERT(2 == kBottomLeft_GrSurfaceOrigin);
+    GR_STATIC_ASSERT(0 == kTopLeft_GrSurfaceOrigin);
+    GR_STATIC_ASSERT(1 == kBottomLeft_GrSurfaceOrigin);
 }
 
 void GrGLSLFragmentShaderBuilder::onFinalize() {