In gm, install drawFilter for pipe and tiledPipe.

gm/gmmain.cpp

Index: gm/gmmain.cpp
diff --git a/gm/gmmain.cpp b/gm/gmmain.cpp
index 30e9296ca133be5781fc4ca094bc986c7ed99fe3..0ac8f8ffce4d884d9609143240a51ace6395bb1b 100644
--- a/gm/gmmain.cpp
+++ b/gm/gmmain.cpp
@@ -901,6 +901,7 @@ public:
             SkISize size = gm->getISize();
             setup_bitmap(gRec, size, &bitmap);
             SkCanvas canvas(bitmap);
+            installFilter(&canvas);

[epoger, 2013/03/15 15:27:16]

As discussed in
https://codereview.chromium.org/12632015/diff/1006/gm/gmmain.cpp#newcode898 , it
disturbs me that this error went unnoticed, and ideally
this fix would be accompanied by self-test improvements that exercise it and
related behavior.

It can be pretty frustrating when our tools don't detect regressions... that's
why I've been adding self-tests to exercise all new gm behavior.  But that does
take time away from other work, so it's a balancing act.

             PipeController pipeController(&canvas);
             SkGPipeWriter writer;
             SkCanvas* pipeCanvas = writer.startRecording(
@@ -927,6 +928,7 @@ public:
             SkISize size = gm->getISize();
             setup_bitmap(gRec, size, &bitmap);
             SkCanvas canvas(bitmap);
+            installFilter(&canvas);
             TiledPipeController pipeController(bitmap);
             SkGPipeWriter writer;
             SkCanvas* pipeCanvas = writer.startRecording(