Support mesa config in render_pictures.

R=epoger@google.com, robertphillips@google.com

Review URL: https://codereview.chromium.org/125083004

git-svn-id: http://skia.googlecode.com/svn/trunk@12916 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tools/PictureRenderer.cpp b/tools/PictureRenderer.cpp
index de7e641..b61288a 100644
--- a/tools/PictureRenderer.cpp
+++ b/tools/PictureRenderer.cpp
@@ -146,6 +146,10 @@
         case kAngle_DeviceType:
             // fall through
 #endif
+#if SK_MESA
+        case kMesa_DeviceType:
+            // fall through
+#endif
         case kGPU_DeviceType: {
             SkAutoTUnref<GrSurface> target;
             if (fGrContext) {