Show the image header for the Context Menu

chrome/browser/ui/android/context_menu_helper.cc

 // Copyright 2013 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/ui/android/context_menu_helper.h"
 
 #include <stdint.h>
 
 #include <vector>
 
@@ skipping 170 matching lines @@
     return;
 
   JNIEnv* env = base::android::AttachCurrentThread();
   base::android::ScopedJavaLocalRef<jbyteArray> j_bytes =
       base::android::ToJavaByteArray(env, thumbnail_data);
 
   Java_ContextMenuHelper_onShareImageReceived(env, java_obj_, jwindow_android,
                                               j_bytes);
 }
 
+void ContextMenuHelper::RetrieveHeaderThumbnail(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& obj) {
+  content::RenderFrameHost* render_frame_host =
+      content::RenderFrameHost::FromID(render_process_id_, render_frame_id_);
+  if (!render_frame_host)
+    return;
+
+  chrome::mojom::ThumbnailCapturerPtr thumbnail_capturer;
+  render_frame_host->GetRemoteInterfaces()->GetInterface(&thumbnail_capturer);
+  // Bind the InterfacePtr into the callback so that it's kept alive until
+  // there's either a connection error or a response.
+  auto* thumbnail_capturer_proxy = thumbnail_capturer.get();
+  thumbnail_capturer_proxy->RequestThumbnailForContextNode(
+      0, gfx::Size(kShareImageMaxWidth, kShareImageMaxHeight),

[David Trainor- moved to gerrit, 2017/03/30 05:03:14]

Our thumbnail size is the same size as the share?  Just confirming this is on
purpose.

[JJ, 2017/03/30 16:00:26]

When running this morning I thought about the display size and realized instead
we could do 216dp * 4(xxxhdpi) = 864 pixels. Thought I could sneakily add that
in before you said something but alas. You caught me before I got it in!

[David Trainor- moved to gerrit, 2017/03/30 23:45:14]

Should we scale this based on the density then?  That should be accessible
through a static in base or ui.

+      base::Bind(&ContextMenuHelper::OnHeaderThumbnailReceived,
+                 weak_factory_.GetWeakPtr(),
+                 base::Passed(&thumbnail_capturer)));
+}
+
+void ContextMenuHelper::OnHeaderThumbnailReceived(
+    chrome::mojom::ThumbnailCapturerPtr thumbnail_capturer,
+    const std::vector<uint8_t>& thumbnail_data,
+    const gfx::Size& original_size) {
+  content::ContentViewCore* content_view_core =
+      content::ContentViewCore::FromWebContents(web_contents_);
+  if (!content_view_core)
+    return;
+
+  base::android::ScopedJavaLocalRef<jobject> jwindow_android(
+      content_view_core->GetWindowAndroid()->GetJavaObject());
+
+  if (jwindow_android.is_null())
+    return;
+
+  JNIEnv* env = base::android::AttachCurrentThread();
+  base::android::ScopedJavaLocalRef<jbyteArray> j_bytes =
+      base::android::ToJavaByteArray(env, thumbnail_data);
+
+  Java_ContextMenuHelper_onHeaderThumbnailReceived(env, java_obj_,
+                                                   jwindow_android, j_bytes);
+}
+
 bool RegisterContextMenuHelper(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }