Create LoadProfile method in profile_manager

chrome/browser/profiles/profile_manager.h

Index: chrome/browser/profiles/profile_manager.h
diff --git a/chrome/browser/profiles/profile_manager.h b/chrome/browser/profiles/profile_manager.h
index b4db4fbcb0e3b288c9597ed570d2f79cdad1bcbe..b88c7e9fd070d3c0ff03a73bde0f4b46714cee63 100644
--- a/chrome/browser/profiles/profile_manager.h
+++ b/chrome/browser/profiles/profile_manager.h
@@ -35,6 +35,7 @@ class ProfileManager : public base::NonThreadSafe,
                        public Profile::Delegate {
  public:
   typedef base::Callback<void(Profile*, Profile::CreateStatus)> CreateCallback;
+  typedef base::Callback<void(Profile*)> ProfileLoadedCallback;
 
   explicit ProfileManager(const base::FilePath& user_data_dir);
   ~ProfileManager() override;
@@ -87,6 +88,18 @@ class ProfileManager : public base::NonThreadSafe,
   // Returns total number of profiles available on this machine.
   size_t GetNumberOfProfiles();
 
+  // Asynchronously loads an existing profile given its |profile_name| within
+  // the user data directory, optionally in |incognito| mode. The |callback|
+  // will be called with the Profile when it has been loaded, or with a nullptr
+  // otherwise. Should be called on the UI thread.
+  // Unlike CreateProfileAsync this will not create a profile if one doesn't
+  // already exist on disk
+  // Returns true if the profile exists, but the final loaded profile will come
+  // as part of the callback.
+  bool LoadProfile(const std::string& profile_name,
+                   bool incognito,
+                   const ProfileLoadedCallback& callback);
+
   // Explicit asynchronous creation of a profile located at |profile_path|.
   // If the profile has already been created then callback is called
   // immediately. Should be called on the UI thread.