Hide fullscreen rotation jank

cc/output/compositor_frame_metadata.h

 // Copyright (c) 2012 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.
 
 #ifndef CC_OUTPUT_COMPOSITOR_FRAME_METADATA_H_
 #define CC_OUTPUT_COMPOSITOR_FRAME_METADATA_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 30 matching lines @@
 
   // These limits can be used together with the scroll/scale fields above to
   // determine if scrolling/scaling in a particular direction is possible.
   gfx::SizeF scrollable_viewport_size;
   gfx::SizeF root_layer_size;
   float min_page_scale_factor = 0.f;
   float max_page_scale_factor = 0.f;
   bool root_overflow_x_hidden = false;
   bool root_overflow_y_hidden = false;
   bool may_contain_video = false;
+  bool is_fullscreen = false;

[aelias_OOO_until_Jul13, 2017/06/17 01:18:34]

What about using root_pass->has_transparent_background instead of introducing
this?  Transparent CC root surfaces pretty much == fullscreen.  Maybe it would
also work better for your size mismatch issue?

 
   // WebView makes quality decisions for rastering resourceless software frames
   // based on information that a scroll or animation is active.
   // TODO(aelias): Remove this and always enable filtering if there aren't apps
   // depending on this anymore.
   bool is_resourceless_software_draw_with_scroll_or_animation = false;
 
   // Used to position the Android location top bar and page content, whose
   // precise position is computed by the renderer compositor.
   float top_controls_height = 0.f;
@@ skipping 56 matching lines @@
   uint32_t frame_token = 0;
 
  private:
   CompositorFrameMetadata(const CompositorFrameMetadata& other);
   CompositorFrameMetadata operator=(const CompositorFrameMetadata&) = delete;
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_COMPOSITOR_FRAME_METADATA_H_