Add basic stacktrace handler using libunwind.

dm/DM.cpp

 // Main binary for DM.
 // For a high-level overview, please see dm/README.
 
 #include "SkBenchmark.h"
 #include "SkCommandLineFlags.h"
 #include "SkForceLinking.h"
 #include "SkGraphics.h"
 #include "SkPicture.h"
 #include "SkString.h"
 #include "Test.h"
 #include "gm.h"
+#include "CrashHandler.h"
 
 #include "DMBenchTask.h"
 #include "DMCpuGMTask.h"
 #include "DMGpuGMTask.h"
 #include "DMGpuSupport.h"
 #include "DMPDFTask.h"
 #include "DMReporter.h"
 #include "DMSKPTask.h"
 #include "DMTask.h"
 #include "DMTaskRunner.h"
@@ skipping 192 matching lines @@
     for (const Registry* reg = head; reg != NULL; reg = reg->next()) {
         SkAutoTDelete<T> forName(reg->factory()(NULL));
         if (!SkCommandLineFlags::ShouldSkip(FLAGS_match, forName->getName())) {
             *out->append() = reg->factory();
         }
     }
 }
 
 int tool_main(int argc, char** argv);
 int tool_main(int argc, char** argv) {
+    SetupCrashHandler();
     SkAutoGraphics ag;
     SkCommandLineFlags::Parse(argc, argv);
 
     if (FLAGS_dryRun) {
         FLAGS_verbose = true;
     }
 #if SK_ENABLE_INST_COUNT
     gPrintInstCount = FLAGS_leaks;
 #endif
     GM::SetResourcePath(FLAGS_resources[0]);
@@ skipping 48 matching lines @@
     reporter.getFailures(&failures);
     report_failures(failures);
     return failures.count() > 0;
 }
 
 #if !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_NACL)
 int main(int argc, char** argv) {
     return tool_main(argc, argv);
 }
 #endif