Add WebView-specific whitelist for crash keys.

android_webview/common/crash_reporter/crash_keys.h

Index: android_webview/common/crash_reporter/crash_keys.h
diff --git a/android_webview/common/crash_reporter/crash_keys.h b/android_webview/common/crash_reporter/crash_keys.h
index 03b2e2a4051688ae4c7529673c56e6612fadc02d..5928d56e423b315c921b1d5de1c6de677d0307de 100644
--- a/android_webview/common/crash_reporter/crash_keys.h
+++ b/android_webview/common/crash_reporter/crash_keys.h
@@ -6,6 +6,7 @@
 #define ANDROID_WEBVIEW_COMMON_CRASH_KEYS_H_
 
 #include <stddef.h>
+#include <string>
 
 namespace android_webview {
 namespace crash_keys {
@@ -13,6 +14,9 @@ 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();
+void InitCrashKeysForWebViewTesting();
+void SetCrashKeyValue(const std::string& key, const std::string& value);
 
 // Crash Key Name Constants ////////////////////////////////////////////////////