Implement support for origin-TopLeft render targets. Note that the default behaviour remains the same:  textures default to origin-TopLeft, render targets default to origin-BottomLeft, and backend textures default to origin-BottomLeft. However, the caller can override the default by setting fOrigin in GrTextureDesc, GrBackendTextureDesc or GrBackendRenderTargetDesc.

Review URL: https://codereview.appspot.com/7230049

git-svn-id: http://skia.googlecode.com/svn/trunk@7594 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/gl/GrGLTexture.cpp b/src/gpu/gl/GrGLTexture.cpp
index f798b31..66d6371 100644
--- a/src/gpu/gl/GrGLTexture.cpp
+++ b/src/gpu/gl/GrGLTexture.cpp
@@ -28,7 +28,6 @@
                                       textureDesc.fIsWrapped));
 
     if (NULL != rtDesc) {
-        GrAssert(kBottomLeft_GrSurfaceOrigin == textureDesc.fOrigin);
         GrGLIRect vp;
         vp.fLeft   = 0;
         vp.fWidth  = textureDesc.fWidth;
@@ -42,14 +41,14 @@
 
 GrGLTexture::GrGLTexture(GrGpuGL* gpu,
                          const Desc& textureDesc)
-    : INHERITED(gpu, textureDesc.fIsWrapped, textureDesc, textureDesc.fOrigin) {
+    : INHERITED(gpu, textureDesc.fIsWrapped, textureDesc) {
     this->init(gpu, textureDesc, NULL);
 }
 
 GrGLTexture::GrGLTexture(GrGpuGL* gpu,
                          const Desc& textureDesc,
                          const GrGLRenderTarget::Desc& rtDesc)
-    : INHERITED(gpu, textureDesc.fIsWrapped, textureDesc, textureDesc.fOrigin) {
+    : INHERITED(gpu, textureDesc.fIsWrapped, textureDesc) {
     this->init(gpu, textureDesc, &rtDesc);
 }