Address some valgrind issues

https://codereview.appspot.com/7448051/



git-svn-id: http://skia.googlecode.com/svn/trunk@7966 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/gl/GrGLProgram.cpp b/src/gpu/gl/GrGLProgram.cpp
index 60bae63..5c88441 100644
--- a/src/gpu/gl/GrGLProgram.cpp
+++ b/src/gpu/gl/GrGLProgram.cpp
@@ -202,8 +202,12 @@
     } else {
         desc->fCoverageAttributeIndex = GrDrawState::kCoverageOverrideAttribIndexValue;
     }
-    desc->fEdgeAttributeIndex     = drawState.getAttribIndex(GrDrawState::kEdge_AttribIndex);
-    desc->fTexCoordAttributeIndex = drawState.getAttribIndex(GrDrawState::kTexCoord_AttribIndex);
+    if (desc->fAttribBindings & GrDrawState::kEdge_AttribBindingsBit) {
+        desc->fEdgeAttributeIndex = drawState.getAttribIndex(GrDrawState::kEdge_AttribIndex);
+    }
+    if (GrDrawState::AttributesBindExplicitTexCoords(desc->fAttribBindings)) {
+        desc->fTexCoordAttributeIndex = drawState.getAttribIndex(GrDrawState::kTexCoord_AttribIndex);
+    }
 
 #if GR_DEBUG
     // verify valid vertex attribute state