Adding MimeHandlerView.

This GuestView type would be used to render out of process pdf through extension.
This introduces BrowserPluginDelegate in content/renderer,
because we need a way to create a MimeHandlerView guest (extensions/ concept)
from BrowserPlugin (content/ concept).

MimeHandlerView is behind --enable-mime-handler-view flag.

BUG=303491
Test=Apply http://crrev.com/392813003/ on top of this CL,
Launch chrome with --out-of-process-pdf flag and --enable-mime-handler-view flag
Navigate to a PDF
Check PDF is served using BrowserPlugin, probably easier to see process associated with the BrowserPlugin from Chrome's task manager.

Review URL: https://codereview.chromium.org/376033002

Cr-Commit-Position: refs/heads/master@{#293613}

1 files changed, 12 insertions, 0 deletions

diff --git a/extensions/browser/extension_message_filter.h b/extensions/browser/extension_message_filter.h
index ac4caaf..8abb39f 100644
--- a/extensions/browser/extension_message_filter.h
+++ b/extensions/browser/extension_message_filter.h
@@ -22,6 +22,7 @@ class DictionaryValue;
 
 namespace content {
 class BrowserContext;
+class WebContents;
 }
 
 namespace extensions {
@@ -64,6 +65,10 @@ class ExtensionMessageFilter : public content::BrowserMessageFilter {
                               int element_instance_id,
                               int guest_instance_id,
                               const base::DictionaryValue& attach_params);
+  void OnExtensionCreateMimeHandlerViewGuest(int render_frame_id,
+                                             const std::string& url,
+                                             const std::string& mime_type,
+                                             int element_instance_id);
   void OnExtensionRemoveLazyListener(const std::string& extension_id,
                                      const std::string& event_name);
   void OnExtensionAddFilteredListener(const std::string& extension_id,
@@ -86,6 +91,13 @@ class ExtensionMessageFilter : public content::BrowserMessageFilter {
       int routing_id,
       const ExtensionHostMsg_Request_Params& params);
 
+  // Runs on UI thread.
+  void MimeHandlerViewGuestCreatedCallback(int element_instance_id,
+                                           int embedder_render_process_id,
+                                           int embedder_render_frame_id,
+                                           const std::string& src,
+                                           content::WebContents* web_contents);
+
   const int render_process_id_;
 
   // Should only be accessed on the UI thread.