Bundle pepper PDF plugin on all platforms (issue #1331).

- Add new libpdf.so library on Linux and PDF.plugin app bundle on OS X.
- Move scaled resources from cef.pak into separate cef_100_percent.pak and cef_200_percent.pak files.
- Password-protected PDF files are not currently supported.
- No fallback is provided for PDF files that contain unsupported features.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@1758 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/browser/browser_host_impl.h

@@ -331,18 +331,6 @@ class CefBrowserHostImpl : public CefBrowserHost,
   // can only be dereferenced on, the UI thread.
   base::WeakPtr<CefBrowserHostImpl> GetWeakPtr();
 
- private:
-  class DevToolsWebContentsObserver;
-
-  static CefRefPtr<CefBrowserHostImpl> CreateInternal(
-      const CefWindowInfo& window_info,
-      const CefBrowserSettings& settings,
-      CefRefPtr<CefClient> client,
-      content::WebContents* web_contents,
-      scoped_refptr<CefBrowserInfo> browser_info,
-      CefWindowHandle opener,
-      CefRefPtr<CefRequestContext> request_context);
-
   // content::WebContentsDelegate methods.
   virtual content::WebContents* OpenURLFromTab(
       content::WebContents* source,
@@ -443,6 +431,18 @@ class CefBrowserHostImpl : public CefBrowserHost,
   // Override to provide a thread safe implementation.
   virtual bool Send(IPC::Message* message) OVERRIDE;
 
+ private:
+  class DevToolsWebContentsObserver;
+
+  static CefRefPtr<CefBrowserHostImpl> CreateInternal(
+      const CefWindowInfo& window_info,
+      const CefBrowserSettings& settings,
+      CefRefPtr<CefClient> client,
+      content::WebContents* web_contents,
+      scoped_refptr<CefBrowserInfo> browser_info,
+      CefWindowHandle opener,
+      CefRefPtr<CefRequestContext> request_context);
+
   // content::WebContentsObserver::OnMessageReceived() message handlers.
   void OnFrameIdentified(int64 frame_id,
                          int64 parent_frame_id,
@@ -456,6 +456,16 @@ class CefBrowserHostImpl : public CefBrowserHost,
   void OnRequest(const Cef_Request_Params& params);
   void OnResponse(const Cef_Response_Params& params);
   void OnResponseAck(int request_id);
+  void OnPDFHasUnsupportedFeature();
+  void OnPDFSaveURLAs(const GURL& url,
+                      const content::Referrer& referrer);
+  void OnPDFUpdateContentRestrictions(int content_restrictions);
+  void OnPDFModalPromptForPassword(const std::string& prompt,
+                                   IPC::Message* reply_message);
+
+  void OnPDFModalPromptForPasswordClosed(IPC::Message* reply_message,
+                                         bool success,
+                                         const base::string16& actual_value);
 
   // content::NotificationObserver methods.
   virtual void Observe(int type,