Fix two leaks & improve leak tracking

gm/megalooper.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkCanvas.h"
 #include "SkBlurMaskFilter.h"
@@ skipping 113 matching lines @@
     // while a difference clip stays at the location of the original rect.
     // Each blurred rect is drawn with a draw looper where the original (non-
     // blurred rect) is offset to reside outside of the large outer clip (so
     // it never appears) but the offset in the draw looper is used to translate
     // the blurred version back into the clip.
     void draw4x1(SkCanvas* canvas, SkScalar x, SkScalar y) {
 
         for (int i = 0; i < 4; ++i) {
             SkPaint loopPaint;
 
-            loopPaint.setLooper(create1Looper(-kOffsetToOutsideClip, 0, gColors[i]));
+            loopPaint.setLooper(create1Looper(-kOffsetToOutsideClip, 0, gColors[i]))->unref();
             loopPaint.setAntiAlias(true);
 
             SkRect outerClip = {
                 -kHalfOuterClipSize, -kHalfOuterClipSize,
                 kHalfOuterClipSize, kHalfOuterClipSize
             };
             outerClip.offset(x, y);
             // center it on the blurred rect
             outerClip.offset(gBlurOffsets[i]);
 
@@ skipping 42 matching lines @@
         rect.offset(x, y);
 
         SkRect outerClip = {
             -kHalfOuterClipSize-kHalfSquareSize, -kHalfOuterClipSize-kHalfSquareSize,
              kHalfOuterClipSize+kHalfSquareSize,  kHalfOuterClipSize+kHalfSquareSize
         };
         outerClip.offset(x, y);
 
         SkPaint paint;
         paint.setAntiAlias(true);
-        paint.setLooper(create4Looper(-kOffsetToOutsideClip-kHalfSquareSize, 0));
+        paint.setLooper(create4Looper(-kOffsetToOutsideClip-kHalfSquareSize, 0))->unref();
 
         canvas->save();
             canvas->clipRect(outerClip, SkRegion::kIntersect_Op);
             canvas->clipRect(rect, SkRegion::kDifference_Op);
 
             rect.offset(SkIntToScalar(kOffsetToOutsideClip+kHalfSquareSize), 0);
             canvas->drawRect(rect, paint);
         canvas->restore();
     }
 
@@ skipping 33 matching lines @@
     { -kHalfSquareSize, -kHalfSquareSize }
 };
 
 const SkColor MegaLooperGM::gColors[4] = {
     SK_ColorGREEN, SK_ColorYELLOW, SK_ColorBLUE, SK_ColorRED
 };
 
 DEF_GM( return new MegaLooperGM(MegaLooperGM::k0x0_Type); )
 DEF_GM( return new MegaLooperGM(MegaLooperGM::k4x1_Type); )
 DEF_GM( return new MegaLooperGM(MegaLooperGM::k1x4_Type); )