0bb413bf71
Migrate the legacy IPC message DragHostMsg_StartDragging to the StartDragging Mojo message in blink.mojom.DragDropHost. WebWidgetClient::StartDragging is changed to return a bool. This allows to move the implementation in RenderWidget to WebFrameWidgetBase, but keep the one in WebWidgetTestProxy. See the discussion at https://crbug.com/1039255#c34. Bug: 1039255 Change-Id: I99aac416d6159836a29d65c16c9ec5c88d48479d Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2320268 Commit-Queue: Henrique Ferreiro <hferreiro@igalia.com> Reviewed-by: Kentaro Hara <haraken@chromium.org> Reviewed-by: Scott Violet <sky@chromium.org> Reviewed-by: Kinuko Yasuda <kinuko@chromium.org> Reviewed-by: Daniel Cheng <dcheng@chromium.org> Cr-Commit-Position: refs/heads/master@{#807886}