Mac: Disable use of AVSampleBufferDisplayLayer

content/common/gpu/ca_layer_tree_mac.mm

 // Copyright 2016 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 "content/common/gpu/ca_layer_tree_mac.h"
 
 #include <AVFoundation/AVFoundation.h>
 #include <CoreMedia/CoreMedia.h>
 #include <CoreVideo/CoreVideo.h>
 
@@ skipping 215 matching lines @@
       background_color(background_color),
       ca_edge_aa_mask(0),
       opacity(opacity) {
   // Because the root layer has setGeometryFlipped:YES, there is some ambiguity
   // about what exactly top and bottom mean. This ambiguity is resolved in
   // different ways for solid color CALayers and for CALayers that have content
   // (surprise!). For CALayers with IOSurface content, the top edge in the AA
   // mask refers to what appears as the bottom edge on-screen. For CALayers
   // without content (solid color layers), the top edge in the AA mask is the
   // top edge on-screen.
-  // http://crbug.com/567946
+  // https://crbug.com/567946
   if (edge_aa_mask & GL_CA_LAYER_EDGE_LEFT_CHROMIUM)
     ca_edge_aa_mask |= kCALayerLeftEdge;
   if (edge_aa_mask & GL_CA_LAYER_EDGE_RIGHT_CHROMIUM)
     ca_edge_aa_mask |= kCALayerRightEdge;
   if (io_surface) {
     if (edge_aa_mask & GL_CA_LAYER_EDGE_TOP_CHROMIUM)
       ca_edge_aa_mask |= kCALayerBottomEdge;
     if (edge_aa_mask & GL_CA_LAYER_EDGE_BOTTOM_CHROMIUM)
       ca_edge_aa_mask |= kCALayerTopEdge;
   } else {
     if (edge_aa_mask & GL_CA_LAYER_EDGE_TOP_CHROMIUM)
       ca_edge_aa_mask |= kCALayerTopEdge;
     if (edge_aa_mask & GL_CA_LAYER_EDGE_BOTTOM_CHROMIUM)
       ca_edge_aa_mask |= kCALayerBottomEdge;
   }
 
   // Only allow 4:2:0 frames which fill the layer's contents to be promoted to
   // AV layers.
   if (IOSurfaceGetPixelFormat(io_surface) ==
           kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange &&
       contents_rect == gfx::RectF(0, 0, 1, 1)) {
-    use_av_layer = true;
+    // Leave AVFoundation disabled for now while crashing and flashing bugs are
+    // being investigated.
+    // https://crbug.com/598243, https://crbug.com/598388
+    use_av_layer = false;
   }
 }
 
 CALayerTree::ContentLayer::ContentLayer(ContentLayer&& layer)
     : io_surface(layer.io_surface),
       contents_rect(layer.contents_rect),
       rect(layer.rect),
       background_color(layer.background_color),
       ca_edge_aa_mask(layer.ca_edge_aa_mask),
       opacity(layer.opacity),
@@ skipping 290 matching lines @@
     } else {
       // Grey represents a CALayer that has not changed.
       color.reset(CGColorCreateGenericRGB(0, 0, 0, 0.1));
     }
     [ca_layer setBorderWidth:1];
     [ca_layer setBorderColor:color];
   }
 }
 
 }  // namespace content