Forward MIME types to BrowserPlugin when a viewer is specified.

chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc

Index: chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
diff --git a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
index 6d953ff0202277f9ef1bfaabf36b503f6f6136d0..0aadc238cb0ef7c25202dd6b67a8c4e0a54bad80 100644
--- a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
+++ b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
@@ -8,6 +8,7 @@
 #include <vector>
 
 #include "base/base64.h"
+#include "base/guid.h"
 #include "base/logging.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ -156,25 +157,19 @@ void UpdatePrerenderNetworkBytesCallback(int render_process_id,
 }
 
 #if !defined(OS_ANDROID)
-// Goes through the extension's file browser handlers and checks if there is one
-// that can handle the |mime_type|.
-// |extension| must not be NULL.
-bool ExtensionCanHandleMimeType(const Extension* extension,
-                                const std::string& mime_type) {
-  MimeTypesHandler* handler = MimeTypesHandler::GetHandler(extension);
-  if (!handler)
-    return false;
-
-  return handler->CanHandleMIMEType(mime_type);
-}
-
 void SendExecuteMimeTypeHandlerEvent(scoped_ptr<content::StreamHandle> stream,
                                      int64 expected_content_size,
                                      int render_process_id,
                                      int render_view_id,
-                                     const std::string& extension_id) {
+                                     const std::string& extension_id,
+                                     const std::string& view_id) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 
+  content::RenderViewHost* render_view_host =
+      content::RenderViewHost::FromID(render_process_id, render_view_id);
+  if (!render_view_host)
+    return;
+
   content::WebContents* web_contents =
       tab_util::GetWebContentsByID(render_process_id, render_view_id);
   if (!web_contents)
@@ -196,7 +191,8 @@ void SendExecuteMimeTypeHandlerEvent(scoped_ptr<content::StreamHandle> stream,
   if (!streams_private)
     return;
   streams_private->ExecuteMimeTypeHandler(
-      extension_id, web_contents, stream.Pass(), expected_content_size);
+      extension_id, web_contents, stream.Pass(), view_id,
+      expected_content_size);
 }
 
 void LaunchURL(const GURL& url, int render_process_id, int render_view_id,
@@ -553,7 +549,9 @@ bool ChromeResourceDispatcherHostDelegate::ShouldInterceptResourceAsStream(
     const GURL& url,
     const std::string& mime_type,
     GURL* origin,
-    std::string* target_id) {
+    std::string* target_id,
+    std::string* payload,
+    std::string* view_id) {
 #if !defined(OS_ANDROID)
   ProfileIOData* io_data =
       ProfileIOData::FromResourceContext(resource_context);
@@ -575,9 +573,14 @@ bool ChromeResourceDispatcherHostDelegate::ShouldInterceptResourceAsStream(
       continue;
     }
 
-    if (ExtensionCanHandleMimeType(extension, mime_type)) {
+    MimeTypesHandler* handler = MimeTypesHandler::GetHandler(extension);
+    if (handler && handler->CanHandleMIMEType(mime_type)) {
       *origin = Extension::GetBaseURLFromExtensionId(extension_id);
       *target_id = extension_id;
+      if (!handler->handler_url().empty()) {
+        *view_id = base::GenerateGUID();
+        *payload = origin->spec() + handler->handler_url() + "?id=" + *view_id;
+      }
       return true;
     }
   }
@@ -590,6 +593,7 @@ void ChromeResourceDispatcherHostDelegate::OnStreamCreated(
     int render_process_id,
     int render_view_id,
     const std::string& target_id,
+    const std::string& view_id,
     scoped_ptr<content::StreamHandle> stream,
     int64 expected_content_size) {
 #if !defined(OS_ANDROID)
@@ -597,7 +601,7 @@ void ChromeResourceDispatcherHostDelegate::OnStreamCreated(
       content::BrowserThread::UI, FROM_HERE,
       base::Bind(&SendExecuteMimeTypeHandlerEvent, base::Passed(&stream),
                  expected_content_size, render_process_id, render_view_id,
-                 target_id));
+                 target_id, view_id));
 #endif
 }