Adds read pixels to GrTexture and GrRenderTarget
Adds SkGrRenderTargetPixelRef for SkBitmaps that are backed by RTs that aren't textures.
Adds onReadPixels implementations for SkGr pixel ref types



git-svn-id: http://skia.googlecode.com/svn/trunk@1056 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gpu/src/GrTextContext.cpp b/gpu/src/GrTextContext.cpp
index e2c81c7..09113e0 100644
--- a/gpu/src/GrTextContext.cpp
+++ b/gpu/src/GrTextContext.cpp
@@ -47,7 +47,7 @@
         GrAssert(fCurrTexture);
         fDrawTarget->setTexture(TEXT_STAGE, fCurrTexture);
 
-        if (!GrTexture::PixelConfigIsAlphaOnly(fCurrTexture->config())) {
+        if (!GrPixelConfigIsAlphaOnly(fCurrTexture->config())) {
             if (kOne_BlendCoeff != fPaint.fSrcBlendCoeff ||
                 kISA_BlendCoeff != fPaint.fDstBlendCoeff ||
                 NULL != fPaint.getTexture()) {