The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2c472009300a73512a5ace3543e2eec9e2cdd5d9

commit 2c472009300a73512a5ace3543e2eec9e2cdd5d9
Author: watk <watk@chromium.org>
Date: Tue Mar 14 05:52:28 2017

Mojoify the RequestThumbnailForContextNode IPC message and reply

Previously thumbnail requests for context nodes were done with two IPC
messages: ChromeViewMsg_RequestThumbnailForContextNode &
ChromeViewHostMsg_RequestThumbnailForContextNode_ACK.

This CL introduces a new per-frame mojo interface, ThumbnailCapturer,
that's exposed by the renderer to the browser.

BUG= 699368 
TEST=existing browsertest, manually tested on linux, mac, android

Review-Url: https://codereview.chromium.org/2737893002
Cr-Commit-Position: refs/heads/master@{#456632}

[modify] https://crrev.com/2c472009300a73512a5ace3543e2eec9e2cdd5d9/chrome/browser/chrome_content_renderer_manifest_overlay.json
[modify] https://crrev.com/2c472009300a73512a5ace3543e2eec9e2cdd5d9/chrome/browser/renderer_context_menu/render_view_context_menu_browsertest.cc
[modify] https://crrev.com/2c472009300a73512a5ace3543e2eec9e2cdd5d9/chrome/browser/ui/android/context_menu_helper.cc
[modify] https://crrev.com/2c472009300a73512a5ace3543e2eec9e2cdd5d9/chrome/browser/ui/android/context_menu_helper.h
[modify] https://crrev.com/2c472009300a73512a5ace3543e2eec9e2cdd5d9/chrome/browser/ui/tab_contents/core_tab_helper.cc
[modify] https://crrev.com/2c472009300a73512a5ace3543e2eec9e2cdd5d9/chrome/browser/ui/tab_contents/core_tab_helper.h
[modify] https://crrev.com/2c472009300a73512a5ace3543e2eec9e2cdd5d9/chrome/common/BUILD.gn
[modify] https://crrev.com/2c472009300a73512a5ace3543e2eec9e2cdd5d9/chrome/common/render_messages.h
[add] https://crrev.com/2c472009300a73512a5ace3543e2eec9e2cdd5d9/chrome/common/thumbnail_capturer.mojom
[modify] https://crrev.com/2c472009300a73512a5ace3543e2eec9e2cdd5d9/chrome/renderer/chrome_render_frame_observer.cc
[modify] https://crrev.com/2c472009300a73512a5ace3543e2eec9e2cdd5d9/chrome/renderer/chrome_render_frame_observer.h