GitLab

This continues the work to onion soup WebClipboard.

- The mojo definition for ClipboardHost is moved from content/common to
  WebKit/common/clipboard.
- The implementation of WebClipboard, content/renderer/webclipboard_impl.* is
  moved to WebKit/Source/platform/expored/WebClipboardImpl.*.
- Fixed the implementation of WebClipboardImpl to use the blink types (
  WTF::String etc) directly rather than WebString.
- Plagiarized parts of DropDataBuilder and URLToImageMarkup as we need to keep
  implementations in content for MockWebClipboardImpl.
- Removed the interface binding from renderer_blink_platform_impl to
  WebClipboardImpl and render_frame_impl (for MACOSX only).
- Instantiate WebClipboardImpl in Platform.cpp (temporary until we can remove
  Clipboard() from platform.)


We cannot remove Platform::Clipboard yet because it is used by
pepper_webplugin_impl, will need see if we can move pepper to use mojo instead.

Next steps;

- Remove MockWebClipboardImpl and mock out at the mojo level instead of
  Platform.
- Provide typemap for blink::mojo::ClipboardBuffer to ui::Clipboard for browser.
- Remove Clipboard() from Platform by fixing pepper.
- Delete public/platform/WebClipboard definition.

Note: Gerrit is not showing which files are renames + modifications, the list is

content/renderer/webclipboard_impl* : Source/platform/exported/WebClipboardImpl*
content/common/clipboard.mojom : WebKit/common/clipboard/clipboard.mojom

Bug: 775830
Change-Id: Ife7121886fe133cc7577cd1ce8f1d90262d97102
Reviewed-on: https://chromium-review.googlesource.com/809824
Commit-Queue: Stuart Langley <slangley@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523640}