Make crash reporting client_id accessible through child_process_logging.

chrome/common/child_process_logging.h

Index: chrome/common/child_process_logging.h
diff --git a/chrome/common/child_process_logging.h b/chrome/common/child_process_logging.h
index 6de7bfe69eeb1775d928d530b33a24f310d3eff6..bdc5a448309a9701aae06fab7bf2aa4e60eed54e 100644
--- a/chrome/common/child_process_logging.h
+++ b/chrome/common/child_process_logging.h
@@ -23,6 +23,13 @@ static const int kMaxReportedActiveExtensions = 10;
 
 namespace child_process_logging {
 
+#if defined(OS_LINUX)
+// These are declared here so the crash reporter can access them directly in
+// compromised context without going through the standard library.
+extern char g_active_url[];
+extern char g_client_id[];
+#endif
+
 // Sets the URL that is logged if the child process crashes. Use GURL() to clear
 // the URL.
 void SetActiveURL(const GURL& url);
@@ -30,6 +37,10 @@ void SetActiveURL(const GURL& url);
 // Sets the Client ID that is used as GUID if a Chrome process crashes.
 void SetClientId(const std::string& client_id);
 
+// Gets the Client ID to be used as GUID for crash reporting. Returns the client
+// id in |client_id| if it's known, an empty string otherwise.
+std::string GetClientId();
+
 // Sets the list of "active" extensions in this process. We overload "active" to
 // mean different things depending on the process type:
 // - browser: all enabled extensions