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

Review URL: https://codereview.chromium.org/1135113005
diff --git a/src/gpu/GrBufferAllocPool.cpp b/src/gpu/GrBufferAllocPool.cpp
index b1a87b8..db19a5b 100644
--- a/src/gpu/GrBufferAllocPool.cpp
+++ b/src/gpu/GrBufferAllocPool.cpp
@@ -8,7 +8,7 @@
 
 
 #include "GrBufferAllocPool.h"
-#include "GrDrawTargetCaps.h"
+#include "GrCaps.h"
 #include "GrGpu.h"
 #include "GrIndexBuffer.h"
 #include "GrTypes.h"