Rename GrPaint fields/enums/members texture->color mask->coverage.

R=robertphillips@google.com
Review URL: https://codereview.appspot.com/6615046

git-svn-id: http://skia.googlecode.com/svn/trunk@5827 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/effects/GrConfigConversionEffect.cpp b/src/gpu/effects/GrConfigConversionEffect.cpp
index 6852f91..3af0979 100644
--- a/src/gpu/effects/GrConfigConversionEffect.cpp
+++ b/src/gpu/effects/GrConfigConversionEffect.cpp
@@ -186,16 +186,16 @@
                                                              (tempTex, false, *pmToUPMRule)));
 
         context->setRenderTarget(readTex->asRenderTarget());
-        paint.textureSampler(0)->setCustomStage(pmToUPMStage1);
+        paint.colorSampler(0)->setCustomStage(pmToUPMStage1);
         context->drawRectToRect(paint, kDstRect, kSrcRect);
 
         readTex->readPixels(0, 0, 256, 256, kRGBA_8888_GrPixelConfig, firstRead);
 
         context->setRenderTarget(tempTex->asRenderTarget());
-        paint.textureSampler(0)->setCustomStage(upmToPMStage);
+        paint.colorSampler(0)->setCustomStage(upmToPMStage);
         context->drawRectToRect(paint, kDstRect, kSrcRect);
         context->setRenderTarget(readTex->asRenderTarget());
-        paint.textureSampler(0)->setCustomStage(pmToUPMStage2);
+        paint.colorSampler(0)->setCustomStage(pmToUPMStage2);
         context->drawRectToRect(paint, kDstRect, kSrcRect);
 
         readTex->readPixels(0, 0, 256, 256, kRGBA_8888_GrPixelConfig, secondRead);