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

chrome/browser/android/tab_android.cc

Index: chrome/browser/android/tab_android.cc
diff --git a/chrome/browser/android/tab_android.cc b/chrome/browser/android/tab_android.cc
index 005669d1972a18eecc865d99ba76532548b442e1..a8e1e09740039f41f9122560a5e3651b0b715af9 100644
--- a/chrome/browser/android/tab_android.cc
+++ b/chrome/browser/android/tab_android.cc
@@ -54,6 +54,8 @@
 #include "components/bookmarks/managed/managed_bookmark_service.h"
 #include "components/dom_distiller/core/url_utils.h"
 #include "components/favicon/content/content_favicon_driver.h"
+#include "components/feature_engagement_tracker/public/feature_constants.h"
+#include "components/feature_engagement_tracker/public/feature_list.h"
 #include "components/navigation_interception/intercept_navigation_delegate.h"
 #include "components/navigation_interception/navigation_params.h"
 #include "components/sessions/content/content_live_tab.h"
@@ -78,6 +80,7 @@
 #include "third_party/WebKit/public/platform/WebReferrerPolicy.h"
 #include "ui/android/view_android.h"
 #include "ui/android/window_android.h"
+#include "ui/base/layout.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/window_open_disposition.h"
 #include "ui/display/display.h"
@@ -380,6 +383,12 @@ void TabAndroid::InitWebContents(
                                                                GetProfile());
   }
   content_layer_->InsertChild(web_contents_->GetNativeView()->GetLayer(), 0);
+
+  if (base::FeatureList::IsEnabled(
+          feature_engagement_tracker::kIPHMediaDownloadFeature)) {
+    media_iph_manager_ =
+        base::MakeUnique<MediaInProductHelpManager>(web_contents_.get(), this);
+  }
 }
 
 void TabAndroid::UpdateDelegates(
@@ -420,6 +429,7 @@ void TabAndroid::DestroyWebContents(JNIEnv* env,
     favicon_driver->RemoveObserver(this);
 
   web_contents()->SetDelegate(NULL);
+  media_iph_manager_.reset();
 
   if (delete_native) {
     // Terminate the renderer process if this is the last tab.
@@ -801,6 +811,39 @@ void TabAndroid::AttachToTabContentManager(
     tab_content_manager_->AttachLiveLayer(GetAndroidId(), GetContentLayer());
 }
 
+void TabAndroid::ShowMediaDownloadInProductHelp(
+    const gfx::Rect& rect_in_frame) {
+  DCHECK(web_contents_);
+
+  // We need to account for the browser controls offset to get the location for
+  // the widget in the view.
+  float content_offset = web_contents_->GetNativeView()->content_offset();
+  gfx::Rect rect_in_view(rect_in_frame.x(), rect_in_frame.y() + content_offset,
+                         rect_in_frame.width(), rect_in_frame.height());
+  gfx::Rect rect_in_view_scaled = gfx::ScaleToEnclosingRectSafe(
+      rect_in_view,
+      ui::GetScaleFactorForNativeView(web_contents_->GetNativeView()));
+
+  JNIEnv* env = base::android::AttachCurrentThread();
+  Java_Tab_showMediaDownloadInProductHelp(
+      env, weak_java_tab_.get(env), rect_in_view_scaled.x(),
+      rect_in_view_scaled.y(), rect_in_view_scaled.width(),
+      rect_in_view_scaled.height());
+}
+
+void TabAndroid::DismissMediaDownloadInProductHelp() {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  Java_Tab_hideMediaDownloadInProductHelp(env, weak_java_tab_.get(env));
+}
+
+void TabAndroid::DownloadMediaInProductHelpDismissed(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jobject>& obj) {
+  DCHECK(media_iph_manager_);
+
+  media_iph_manager_->WidgetDismissed();
+}
+
 scoped_refptr<content::DevToolsAgentHost> TabAndroid::GetDevToolsAgentHost() {
   return devtools_host_;
 }