Partially componentize chrome/common/crash_keys.

ios/chrome/browser/crash_report/crash_keys.cc

+// Copyright 2015 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 "ios/chrome/browser/crash_report/crash_keys.h"
+
+#include "base/debug/crash_logging.h"
+#include "base/macros.h"
+#include "breakpad/src/common/simple_string_dictionary.h"
+#include "components/crash_keys/crash_keys.h"
+
+namespace {
+
+// The maximum lengths specified by breakpad include the trailing NULL, so
+// the actual length of the string is one less.
+static const size_t kSingleChunkLength =
+    google_breakpad::SimpleStringDictionary::value_size - 1;
+}
+
+size_t RegisterChromeIOSCrashKeys() {
+  // The following keys may be chunked by the underlying crash logging system,
+  // but ultimately constitute a single key-value pair.
+  base::debug::CrashKey fixed_keys[] = {
+      {crash_keys::kMetricsClientId, crash_keys::kSmallSize},
+      {crash_keys::kChannel, crash_keys::kSmallSize},
+      {crash_keys::kNumVariations, crash_keys::kSmallSize},
+      {crash_keys::kVariations, crash_keys::kLargeSize},
+      {crash_keys::mac::kZombie, crash_keys::kMediumSize},
+      {crash_keys::mac::kZombieTrace, crash_keys::kMediumSize},
+  };
+
+  return base::debug::InitCrashKeys(fixed_keys, arraysize(fixed_keys),
+                                    kSingleChunkLength);
+}