Add GetIsPinnedToTaskbarState()

chrome/browser/shell_integration_win.h

Index: chrome/browser/shell_integration_win.h
diff --git a/chrome/browser/shell_integration_win.h b/chrome/browser/shell_integration_win.h
index 3d81886fcd413aad42c34563885d70952cb7025f..8e3c46665fe82ab46098787e9d0c9556b4a5d01e 100644
--- a/chrome/browser/shell_integration_win.h
+++ b/chrome/browser/shell_integration_win.h
@@ -57,9 +57,16 @@ base::string16 GetAppModelIdForProfile(const base::string16& app_name,
 // calling GetAppModelIdForProfile() with ShellUtil::GetAppId() as app_name.
 base::string16 GetChromiumModelIdForProfile(const base::FilePath& profile_path);
 
-// Records the pinned state of the current executable into a histogram. Must be
-// called on the IO thread.
-void RecordIsPinnedToTaskbarHistogram();
+// Returns the taskbar pin state of Chrome via the IsPinnedToTaskbarCallback.
+// The first bool is true if the state could be calculated, and the second bool
+// is true if Chrome is pinned to the taskbar.
+// The ConnectionErrorCallback is called instead if something wrong happened
+// with the connection to the remote process.
+using ConnectionErrorCallback = base::Closure;
+using IsPinnedToTaskbarCallback = base::Callback<void(bool, bool)>;
+void GetIsPinnedToTaskbarState(
+    const ConnectionErrorCallback& on_error_callback,
+    const IsPinnedToTaskbarCallback& result_callback);
 
 // Migrates existing chrome taskbar pins by tagging them with correct app id.
 // see http://crbug.com/28104