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/gm/texdata.cpp b/gm/texdata.cpp
index cf1a701..a87be45 100644
--- a/gm/texdata.cpp
+++ b/gm/texdata.cpp
@@ -115,10 +115,10 @@
                 ctx->setMatrix(vm);
                 GrMatrix tm;
                 tm = vm;
-                GrMatrix* sampleMat = paint.textureSampler(0)->matrix();
+                GrMatrix* sampleMat = paint.colorSampler(0)->matrix();
                 *sampleMat = vm;
                 sampleMat->postIDiv(2*S, 2*S);
-                paint.textureSampler(0)->setCustomStage(
+                paint.colorSampler(0)->setCustomStage(
                     SkNEW_ARGS(GrSingleTextureEffect, (texture)))->unref();