rename GrDrawTargetCaps.h to GrCaps.h and move to include

Review URL: https://codereview.chromium.org/1135113005
diff --git a/src/gpu/effects/GrPorterDuffXferProcessor.cpp b/src/gpu/effects/GrPorterDuffXferProcessor.cpp
index 424fbbf..43cdc40 100644
--- a/src/gpu/effects/GrPorterDuffXferProcessor.cpp
+++ b/src/gpu/effects/GrPorterDuffXferProcessor.cpp
@@ -8,7 +8,7 @@
 #include "effects/GrPorterDuffXferProcessor.h"
 
 #include "GrBlend.h"
-#include "GrDrawTargetCaps.h"
+#include "GrCaps.h"
 #include "GrProcessor.h"
 #include "GrProcOptInfo.h"
 #include "GrTypes.h"