Implement PluginsPermissionContext and hookup to flash download interception.

chrome/browser/plugins/plugins_permission_context.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/plugins/plugins_permission_context.h"
 
+#include "chrome/browser/content_settings/host_content_settings_map_factory.h"
+#include "chrome/browser/infobars/infobar_service.h"
+#include "chrome/browser/permissions/permission_request_id.h"
+#include "chrome/browser/plugins/plugin_utils.h"
+#include "chrome/browser/plugins/plugins_field_trial.h"
+#include "chrome/browser/ui/website_settings/website_settings_infobar_delegate.h"
+#include "content/public/browser/render_frame_host.h"
+
 PluginsPermissionContext::PluginsPermissionContext(Profile* profile)
     : PermissionContextBase(profile,
                             content::PermissionType::PLUGINS,
                             CONTENT_SETTINGS_TYPE_PLUGINS) {}
 
 PluginsPermissionContext::~PluginsPermissionContext() {}
 
+ContentSetting PluginsPermissionContext::GetPermissionStatus(
+    const GURL& requesting_origin,
+    const GURL& embedding_origin) const {
+  ContentSetting flash_setting = PluginUtils::GetFlashPluginContentSetting(
+      HostContentSettingsMapFactory::GetForProfile(profile()),
+      requesting_origin, embedding_origin);
+  flash_setting = PluginsFieldTrial::EffectiveContentSetting(
+      CONTENT_SETTINGS_TYPE_PLUGINS, flash_setting);
+  if (flash_setting == CONTENT_SETTING_DETECT_IMPORTANT_CONTENT)
+    return CONTENT_SETTING_ASK;
+  return flash_setting;
+}
+
+void PluginsPermissionContext::UpdateTabContext(const PermissionRequestID& id,
+                                                const GURL& requesting_origin,
+                                                bool allowed) {
+  if (allowed) {
+    content::WebContents* web_contents =
+        content::WebContents::FromRenderFrameHost(
+            content::RenderFrameHost::FromID(id.render_process_id(),
+                                             id.render_frame_id()));
+    InfoBarService* infobar_service =
+        InfoBarService::FromWebContents(web_contents);
+    if (infobar_service)
+      WebsiteSettingsInfoBarDelegate::Create(infobar_service);
+  }
+}
+
 bool PluginsPermissionContext::IsRestrictedToSecureOrigins() const {
   return false;
 }