Add WebView-specific whitelist for crash keys.

android_webview/common/crash_reporter/crash_keys.h

 // Copyright 2017 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.
 
 #ifndef ANDROID_WEBVIEW_COMMON_CRASH_KEYS_H_
 #define ANDROID_WEBVIEW_COMMON_CRASH_KEYS_H_
 
 #include <stddef.h>
 
 namespace android_webview {
 namespace crash_keys {
 
 // Registers all of the potential crash keys that can be sent to the crash
 // reporting server. Returns the size of the union of all keys.
 size_t RegisterWebViewCrashKeys();
+const char** GetWhiteListedWebViewCrashKeys();
 
 // Crash Key Name Constants ////////////////////////////////////////////////////
 
 // GPU information.
 extern const char kGPUDriverVersion[];
 extern const char kGPUPixelShaderVersion[];
 extern const char kGPUVertexShaderVersion[];
 extern const char kGPUVendor[];
 extern const char kGPURenderer[];
 
 
 }  // namespace crash_keys
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_COMMON_CRASH_KEYS_H_