Move the SigninProcess APIs from SigninManager to ChromeSigninClient.

chrome/browser/signin/chrome_signin_client.h

Index: chrome/browser/signin/chrome_signin_client.h
diff --git a/chrome/browser/signin/chrome_signin_client.h b/chrome/browser/signin/chrome_signin_client.h
index d5a4e307edadbf8c8dd1ee5fb4e4dc7893462926..b51bcc065ed191510939f66ba5ed4bd7e3f1606f 100644
--- a/chrome/browser/signin/chrome_signin_client.h
+++ b/chrome/browser/signin/chrome_signin_client.h
@@ -9,11 +9,14 @@
 #include "base/compiler_specific.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/signin/core/browser/signin_client.h"
+#include "content/public/browser/render_process_host_observer.h"
 
 class CookieSettings;
 class Profile;
 
-class ChromeSigninClient : public SigninClient, public KeyedService {
+class ChromeSigninClient : public SigninClient,
+                           public KeyedService,
+                           public content::RenderProcessHostObserver {
  public:
   explicit ChromeSigninClient(Profile* profile);
   virtual ~ChromeSigninClient();
@@ -22,6 +25,23 @@ class ChromeSigninClient : public SigninClient, public KeyedService {
   static bool ProfileAllowsSigninCookies(Profile* profile);
   static bool SettingsAllowSigninCookies(CookieSettings* cookie_settings);
 
+  // Tracks the privileged signin process identified by |host_id| so that we
+  // can later ask (via IsSigninProcess) if it is safe to sign the user in from
+  // the current context (see OneClickSigninHelper).  All of this tracking
+  // state is reset once the renderer process terminates.
+  //
+  // N.B. This is the id returned by RenderProcessHost::GetID().
+  // TODO(guohui): Eliminate these APIs once the web-based signin flow is
+  // replaced by a native flow. crbug.com/347247
+  void SetSigninProcess(int host_id);
+  void ClearSigninProcess();
+  bool IsSigninProcess(int host_id) const;
+  bool HasSigninProcess() const;
+
+  // content::RenderProcessHostObserver implementation.
+  virtual void RenderProcessHostDestroyed(content::RenderProcessHost* host)
+      OVERRIDE;
+
   // SigninClient implementation.
   virtual PrefService* GetPrefs() OVERRIDE;
   virtual scoped_refptr<TokenWebData> GetDatabase() OVERRIDE;
@@ -33,6 +53,13 @@ class ChromeSigninClient : public SigninClient, public KeyedService {
  private:
   Profile* profile_;
 
+  // See SetSigninProcess. Tracks the currently active signin process
+  // by ID, if there is one.
+  int signin_host_id_;
+
+  // The RenderProcessHosts being observed.
+  std::set<content::RenderProcessHost*> signin_hosts_observed_;
+
   DISALLOW_COPY_AND_ASSIGN(ChromeSigninClient);
 };