Add direct getter for GrCaps to GrContext.

TBR=joshualitt@google.com

Review URL: https://codereview.chromium.org/1149773005
diff --git a/tests/GrDrawTargetTest.cpp b/tests/GrDrawTargetTest.cpp
index 341eba5..14d4f78 100644
--- a/tests/GrDrawTargetTest.cpp
+++ b/tests/GrDrawTargetTest.cpp
@@ -29,7 +29,7 @@
             continue;
         }
 
-        test_print(reporter, grContext->getGpu()->caps());
+        test_print(reporter, grContext->caps());
     }
 }