chrome/blink: Add functionality for in-product help for media elements.

chrome/browser/android/tab_android.h

Index: chrome/browser/android/tab_android.h
diff --git a/chrome/browser/android/tab_android.h b/chrome/browser/android/tab_android.h
index ae6bdce6ea50c35655855c9e60892ab7931bec42..cc2cd868e25b356248c61d3b76b086ef8c76eb7a 100644
--- a/chrome/browser/android/tab_android.h
+++ b/chrome/browser/android/tab_android.h
@@ -14,6 +14,7 @@
 #include "base/android/scoped_java_ref.h"
 #include "base/callback_forward.h"
 #include "base/macros.h"
+#include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
 #include "chrome/browser/sync/glue/synced_tab_delegate_android.h"
 #include "chrome/browser/ui/tab_contents/core_tab_helper_delegate.h"
@@ -23,6 +24,9 @@
 #include "components/toolbar/toolbar_model.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "services/service_manager/public/cpp/binder_registry.h"
+#include "third_party/WebKit/public/platform/media_download_in_product_help.mojom.h"
 
 class GURL;
 class Profile;
@@ -51,7 +55,8 @@ class PrerenderManager;
 
 class TabAndroid : public CoreTabHelperDelegate,
                    public content::NotificationObserver,
-                   public favicon::FaviconDriverObserver {
+                   public favicon::FaviconDriverObserver,
+                   public content::WebContentsObserver {
  public:
   // A Java counterpart will be generated for this enum.
   // GENERATED_JAVA_ENUM_PACKAGE: org.chromium.chrome.browser
@@ -253,6 +258,10 @@ class TabAndroid : public CoreTabHelperDelegate,
       const base::android::JavaParamRef<jobject>& obj,
       jboolean enabled);
 
+  void MediaDownloadInProductHelpDismissed(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& obj);
+
   bool ShouldEnableEmbeddedMediaExperience() const;
 
   scoped_refptr<content::DevToolsAgentHost> GetDevToolsAgentHost();
@@ -265,9 +274,24 @@ class TabAndroid : public CoreTabHelperDelegate,
   // Register the Tab's native methods through JNI.
   static bool RegisterTabAndroid(JNIEnv* env);
 
+  // content::WebContents implementation.
+  void RenderFrameCreated(content::RenderFrameHost* render_frame_host) override;
+  void RenderFrameDeleted(content::RenderFrameHost* render_frame_host) override;
+
  private:
+  class MediaDownloadInProductHelp;
+
   prerender::PrerenderManager* GetPrerenderManager() const;
 
+  // methods used by MediaDownloadInProductHelp.
+  void CreateInProductHelpService(
+      content::RenderFrameHost* render_frame_host,
+      const service_manager::BindSourceInfo& source_info,
+      blink::mojom::MediaDownloadInProductHelpRequest request);
+  void ShowMediaDownloadInProductHelp(const gfx::Rect& rect_in_frame);
+  void DismissMediaDownloadInProductHelp();
+  void OnMediaDownloadInProductHelpConnectionError();
+
   JavaObjectWeakGlobalRef weak_java_tab_;
 
   // The identifier used by session restore for this tab.
@@ -290,6 +314,10 @@ class TabAndroid : public CoreTabHelperDelegate,
   std::string webapp_manifest_scope_;
   bool embedded_media_experience_enabled_;
 
+  std::unique_ptr<MediaDownloadInProductHelp> media_in_product_help_;
+
+  base::WeakPtrFactory<TabAndroid> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(TabAndroid);
 };