Add basic stacktrace handler using libunwind.

gm/gmmain.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /*
  * Code for the "gm" (Golden Master) rendering comparison tool.
  *
  * If you make changes to this, re-run the self-tests at gm/tests/run.sh
  * to make sure they still pass... you may need to change the expected
  * results of the self-test.
  */
 
 #include "gm.h"
 #include "gm_error.h"
 #include "gm_expectations.h"
 #include "system_preferences.h"
+#include "CrashHandler.h"
 #include "SkBitmap.h"
 #include "SkColorPriv.h"
 #include "SkCommandLineFlags.h"
 #include "SkData.h"
 #include "SkDeferredCanvas.h"
 #include "SkDevice.h"
 #include "SkDocument.h"
 #include "SkDrawFilter.h"
 #include "SkForceLinking.h"
 #include "SkGPipe.h"
@@ skipping 2192 matching lines @@
 static bool parse_flags_jpeg_quality() {
     if (FLAGS_pdfJpegQuality < -1 || FLAGS_pdfJpegQuality > 100) {
         SkDebugf("%s\n", "pdfJpegQuality must be in [-1 .. 100] range.");
         return false;
     }
     return true;
 }
 
 int tool_main(int argc, char** argv);
 int tool_main(int argc, char** argv) {
+    SetupCrashHandler();
 
     SkString usage;
     usage.printf("Run the golden master tests.\n");
     SkCommandLineFlags::SetUsage(usage.c_str());
     SkCommandLineFlags::Parse(argc, argv);
 
 #if SK_ENABLE_INST_COUNT
     if (FLAGS_leaks) {
         gPrintInstCount = true;
     }
@@ skipping 221 matching lines @@
     if (FLAGS_forceBWtext) {
         canvas->setDrawFilter(SkNEW(BWTextDrawFilter))->unref();
     }
 }
 
 #if !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_NACL)
 int main(int argc, char * const argv[]) {
     return tool_main(argc, (char**) argv);
 }
 #endif