Add support for getting the 256x256 app icon on Windows.

base/win/resource_util.h

Index: base/win/resource_util.h
===================================================================
--- base/win/resource_util.h	(revision 176351)
+++ base/win/resource_util.h	(working copy)
@@ -16,6 +16,13 @@
 namespace base {
 namespace win {
 
+// Function for getting a data resource of the specified |resource_type| from
+// a dll.  Some resources are optional, especially in unit tests, so this
+// returns false but doesn't raise an error if the resource can't be loaded.
+bool BASE_EXPORT GetResourceFromModule(HMODULE module, int resource_id,
+                                       LPCTSTR resource_type, void** data,
+                                       size_t* length);
+
 // Function for getting a data resource (BINDATA) from a dll.  Some
 // resources are optional, especially in unit tests, so this returns false
 // but doesn't raise an error if the resource can't be loaded.