From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Cheng Zhao <zcbenz@gmail.com>
Date: Thu, 20 Sep 2018 17:48:49 -0700
Subject: mas: disable remote layer APIs (CAContext and CALayerHost) for MAS
 build

Accordin to ccameron:

For apps that spend a lot of time watching video (especially fullscreen video),
the power/battery usage will likely increase 1.5x to 2x. For something that is,
e.g, scrolling, it'll be smaller, more like 1.15x or 1.25x.

In terms of performance, the impact will likely be fairly small -- any app that
could hit 60fps before will likely still be able to hit 60fps. There may even be
cases where performance improves when disabling remote CoreAnimation (remote
CoreAnimation is really only about battery usage).

diff --git a/gpu/ipc/service/image_transport_surface_overlay_mac.h b/gpu/ipc/service/image_transport_surface_overlay_mac.h
index 71c48ed69f2ee9586620966333c744a6d1533cad..93791bac239fae71ed4cf790c08f0435cd2edb95 100644
--- a/gpu/ipc/service/image_transport_surface_overlay_mac.h
+++ b/gpu/ipc/service/image_transport_surface_overlay_mac.h
@@ -18,7 +18,9 @@
 #include "ui/gl/gpu_switching_observer.h"
 #include "ui/gl/presenter.h"
 
+#if !IS_MAS_BUILD()
 @class CAContext;
+#endif
 @class CALayer;
 
 namespace ui {
@@ -91,7 +93,9 @@ class ImageTransportSurfaceOverlayMacEGL : public gl::Presenter,
 #if BUILDFLAG(IS_MAC)
   bool use_remote_layer_api_;
 #endif
+#if !IS_MAS_BUILD()
   base::scoped_nsobject<CAContext> ca_context_;
+#endif
   std::unique_ptr<ui::CALayerTreeCoordinator> ca_layer_tree_coordinator_;
 
   gfx::Size pixel_size_;
diff --git a/gpu/ipc/service/image_transport_surface_overlay_mac.mm b/gpu/ipc/service/image_transport_surface_overlay_mac.mm
index b726596b926d5cd4d7131997dc07beaf04757612..39bb2d52f61a911c65395f6f643ef12a06f3a392 100644
--- a/gpu/ipc/service/image_transport_surface_overlay_mac.mm
+++ b/gpu/ipc/service/image_transport_surface_overlay_mac.mm
@@ -80,12 +80,14 @@
 
   // Create the CAContext to send this to the GPU process, and the layer for
   // the context.
+#if !IS_MAS_BUILD()
   if (use_remote_layer_api_) {
     CGSConnectionID connection_id = CGSMainConnectionID();
     ca_context_.reset([[CAContext contextWithCGSConnection:connection_id
                                                    options:@{}] retain]);
     [ca_context_ setLayer:ca_layer_tree_coordinator_->GetCALayerForDisplay()];
   }
+#endif //!IS_MAS_BUILD()
 #else
   ca_layer_tree_coordinator_ = std::make_unique<ui::CALayerTreeCoordinator>(
       /*allow_remote_layers=*/false, allow_av_sample_buffer_display_layer);
@@ -185,7 +187,9 @@
                          "width", pixel_size_.width());
 #if BUILDFLAG(IS_MAC)
     if (use_remote_layer_api_) {
+#if !IS_MAS_BUILD()
       params.ca_context_id = [ca_context_ contextId];
+#endif
     } else {
 #else
     if (true) {
diff --git a/ui/accelerated_widget_mac/display_ca_layer_tree.mm b/ui/accelerated_widget_mac/display_ca_layer_tree.mm
index 2c4821b34f71d30ce814bd1f3cf9a7a76bbaac66..c7dc371c780a405f502a84c77e92251ae08f66e0 100644
--- a/ui/accelerated_widget_mac/display_ca_layer_tree.mm
+++ b/ui/accelerated_widget_mac/display_ca_layer_tree.mm
@@ -99,6 +99,7 @@ - (void)setContentsChanged;
 }
 
 void DisplayCALayerTree::GotCALayerFrame(uint32_t ca_context_id) {
+#if !IS_MAS_BUILD()
   // Early-out if the remote layer has not changed.
   if ([remote_layer_ contextId] == ca_context_id)
     return;
@@ -123,6 +124,9 @@ - (void)setContentsChanged;
     [io_surface_layer_ removeFromSuperlayer];
     io_surface_layer_.reset();
   }
+#else
+  NOTREACHED() << "Remote layer is being used in MAS build";
+#endif
 }
 
 void DisplayCALayerTree::GotIOSurfaceFrame(
diff --git a/ui/base/cocoa/remote_layer_api.h b/ui/base/cocoa/remote_layer_api.h
index 9b691e2f16c68235dd180a28b6eb2eefc91f8e4c..9d4a7fb36e671980024b895eaafab2d970ac2818 100644
--- a/ui/base/cocoa/remote_layer_api.h
+++ b/ui/base/cocoa/remote_layer_api.h
@@ -13,6 +13,7 @@
 
 #include "base/component_export.h"
 
+#if !IS_MAS_BUILD()
 // The CGSConnectionID is used to create the CAContext in the process that is
 // going to share the CALayers that it is rendering to another process to
 // display.
@@ -50,6 +51,8 @@ typedef uint32_t CAContextID;
 
 #endif // __OBJC__
 
+#endif // MAS_BUILD
+
 namespace ui {
 
 // This function will check if all of the interfaces listed above are supported
diff --git a/ui/base/cocoa/remote_layer_api.mm b/ui/base/cocoa/remote_layer_api.mm
index e23eb7719a9798afe984c6af6a422167b93d89b5..d448bc09ee54fc77f1ed4d088d1369b96f83a1db 100644
--- a/ui/base/cocoa/remote_layer_api.mm
+++ b/ui/base/cocoa/remote_layer_api.mm
@@ -10,6 +10,7 @@
 
 namespace ui {
 
+#if !IS_MAS_BUILD()
 namespace {
 // Control use of cross-process CALayers to display content directly from the
 // GPU process on Mac.
@@ -17,8 +18,10 @@
              "RemoteCoreAnimationAPI",
              base::FEATURE_ENABLED_BY_DEFAULT);
 }  // namespace
+#endif
 
 bool RemoteLayerAPISupported() {
+#if !IS_MAS_BUILD()
   if (!base::FeatureList::IsEnabled(kRemoteCoreAnimationAPI))
     return false;
 
@@ -50,6 +53,9 @@ bool RemoteLayerAPISupported() {
 
   // If everything is there, we should be able to use the API.
   return true;
+#else
+  return false;
+#endif  // MAS_BUILD
 }
 
 }  // namespace
