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 40390ee71210538220fd735af311cc3ec0e1f311..bc0d3b843f1aa790dea018c95a9aa956679ce61b 100644
--- a/chrome/browser/android/tab_android.h
+++ b/chrome/browser/android/tab_android.h
@@ -15,6 +15,7 @@
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
+#include "chrome/browser/android/media_iph_manager.h"
 #include "chrome/browser/sync/glue/synced_tab_delegate_android.h"
 #include "chrome/browser/ui/tab_contents/core_tab_helper_delegate.h"
 #include "components/favicon/core/favicon_driver_observer.h"
@@ -51,7 +52,8 @@ class PrerenderManager;
 
 class TabAndroid : public CoreTabHelperDelegate,
                    public content::NotificationObserver,
-                   public favicon::FaviconDriverObserver {
+                   public favicon::FaviconDriverObserver,
+                   public MediaIPHManagerClient {
  public:
   // A Java counterpart will be generated for this enum.
   // GENERATED_JAVA_ENUM_PACKAGE: org.chromium.chrome.browser
@@ -135,6 +137,11 @@ class TabAndroid : public CoreTabHelperDelegate,
                         bool icon_url_changed,
                         const gfx::Image& image) override;
 
+  // MediaIPHManagerClient implementation.
+  bool ShowMediaDownloadIPH() override;
+  void UpdateMediaDownloadIPHPosition(const gfx::Rect& rect_in_frame) override;
+  void DismissMediaDownloadIPH() override;
+
   // Returns true if this tab is currently presented in the context of custom
   // tabs. Tabs can be moved between different activities so the returned value
   // might change over the lifetime of the tab.
@@ -246,6 +253,10 @@ class TabAndroid : public CoreTabHelperDelegate,
       const base::android::JavaParamRef<jobject>& obj,
       jboolean enabled);
 
+  void DownloadMediaIPHDismissed(
+      JNIEnv* env,
+      const base::android::JavaParamRef<jobject>& obj);
+
   bool ShouldEnableEmbeddedMediaExperience() const;
 
   scoped_refptr<content::DevToolsAgentHost> GetDevToolsAgentHost();
@@ -279,6 +290,7 @@ class TabAndroid : public CoreTabHelperDelegate,
       web_contents_delegate_;
   scoped_refptr<content::DevToolsAgentHost> devtools_host_;
   std::unique_ptr<browser_sync::SyncedTabDelegateAndroid> synced_tab_delegate_;
+  std::unique_ptr<MediaIPHManager> media_iph_manager_;
 
   std::string webapp_manifest_scope_;
   bool embedded_media_experience_enabled_;