Annotate CaptureDumpPixels for MemorySanitizer.

content/shell/renderer/webkit_test_runner.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/shell/renderer/webkit_test_runner.h"
 
 #include <algorithm>
 #include <clocale>
 #include <cmath>
 
 #include "base/base64.h"
 #include "base/command_line.h"
+#include "base/compiler_specific.h"
 #include "base/debug/debugger.h"
 #include "base/files/file_path.h"
 #include "base/md5.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
@@ skipping 636 matching lines @@
   }
 
   CaptureDumpComplete();
 }
 
 void WebKitTestRunner::CaptureDumpPixels(const SkBitmap& snapshot) {
   DCHECK_NE(0, snapshot.info().fWidth);
   DCHECK_NE(0, snapshot.info().fHeight);
 
   SkAutoLockPixels snapshot_lock(snapshot);
+  // The snapshot arrives from the GPU process via shared memory. Because MSan
+  // can't track initializedness across processes, we must assure it that the
+  // pixels are in fact initialized.
+  MSAN_UNPOISON(snapshot.getPixels(), snapshot.getSize());
   base::MD5Digest digest;
   base::MD5Sum(snapshot.getPixels(), snapshot.getSize(), &digest);
   std::string actual_pixel_hash = base::MD5DigestToBase16(digest);
 
   if (actual_pixel_hash == test_config_.expected_pixel_hash) {
     SkBitmap empty_image;
     Send(new ShellViewHostMsg_ImageDump(
         routing_id(), actual_pixel_hash, empty_image));
   } else {
     Send(new ShellViewHostMsg_ImageDump(
@@ skipping 63 matching lines @@
 
   leak_detector_->TryLeakDetection(main_frame);
 }
 
 void WebKitTestRunner::ReportLeakDetectionResult(
     const LeakDetectionResult& report) {
   Send(new ShellViewHostMsg_LeakDetectionDone(routing_id(), report));
 }
 
 }  // namespace content