Spoof as Safari when running Silverlight 4 on the Mac

Silverlight 4 doesn't support Chrome, so Chrome doesn't end up on the right event path; spoofing as Safari fixes mouseover handling, and doesn't appear to regress anything.

BUG=46842
TEST=Mouseovers should work in Silverlight 4 on the Mac.

Review URL: http://codereview.chromium.org/2805019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@50360 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 17 insertions, 6 deletions

diff --git a/webkit/glue/plugins/plugin_host.cc b/webkit/glue/plugins/plugin_host.cc
index 02e4af9..ba6ac76 100644
--- a/webkit/glue/plugins/plugin_host.cc
+++ b/webkit/glue/plugins/plugin_host.cc
@@ -561,18 +561,29 @@ const char* NPN_UserAgent(NPP id) {
   // Flash passes in a null id during the NP_initialize call.  We need to
   // default to the Mozilla user agent if we don't have an NPP instance or
   // else Flash won't request windowless mode.
+  bool use_mozilla_user_agent = true;
   if (id) {
     scoped_refptr<NPAPI::PluginInstance> plugin = FindInstance(id);
     if (plugin.get() && !plugin->use_mozilla_user_agent())
-      return webkit_glue::GetUserAgent(GURL()).c_str();
+      use_mozilla_user_agent = false;
   }
 
-  return "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a1) Gecko/20061103 Firefox/2.0a1";
-#else
-  // TODO(port): For now we always use our real useragent on Mac and Linux.
-  // We might eventually need to spoof for some plugins.
-  return webkit_glue::GetUserAgent(GURL()).c_str();
+  if (use_mozilla_user_agent)
+    return "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a1) Gecko/20061103 Firefox/2.0a1";
+#elif defined(OS_MACOSX)
+  // Silverlight 4 doesn't handle events correctly unless we claim to be Safari.
+  scoped_refptr<NPAPI::PluginInstance> plugin = FindInstance(id);
+  if (plugin.get()) {
+    WebPluginInfo plugin_info = plugin->plugin_lib()->plugin_info();
+    if (plugin_info.name == L"Silverlight Plug-In" &&
+        StartsWith(plugin_info.version, L"4.", false)) {
+      return "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_4; en-us) "
+          "AppleWebKit/534.1+ (KHTML, like Gecko) Version/5.0 Safari/533.16";
+    }
+  }
 #endif
+
+  return webkit_glue::GetUserAgent(GURL()).c_str();
 }
 
 void NPN_Status(NPP id, const char* message) {