Beginning of support for texture rectangles.

src/gpu/gl/builders/GrGLProgramBuilder.cpp

Index: src/gpu/gl/builders/GrGLProgramBuilder.cpp
diff --git a/src/gpu/gl/builders/GrGLProgramBuilder.cpp b/src/gpu/gl/builders/GrGLProgramBuilder.cpp
index 4503d1a1972d49f2c259d31ae41b4d44b469175a..4a1b2e9ac5a5f16b0f8b4770a836ec3978c06533 100644
--- a/src/gpu/gl/builders/GrGLProgramBuilder.cpp
+++ b/src/gpu/gl/builders/GrGLProgramBuilder.cpp
@@ -74,6 +74,8 @@ static GrSLType get_sampler_type(const GrTextureAccess& access) {
     GrGLTexture* glTexture = static_cast<GrGLTexture*>(access.getTexture());
     if (glTexture->target() == GR_GL_TEXTURE_EXTERNAL) {
         return kSamplerExternal_GrSLType;
+    } else if (glTexture->target() == GR_GL_TEXTURE_RECTANGLE) {
+        return kSampler2DRect_GrSLType;
     } else {
         SkASSERT(glTexture->target() == GR_GL_TEXTURE_2D);
         return kSampler2D_GrSLType;