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 655dca3b5628eae2d13bce22e24a517113701480..30b97c47b6804d5677f87a59d7d5c6028f6d4bf4 100644
--- a/gpu/ipc/service/image_transport_surface_overlay_mac.h
+++ b/gpu/ipc/service/image_transport_surface_overlay_mac.h
@@ -23,7 +23,9 @@
 #include "ui/display/types/display_constants.h"
 #endif
 
+#if !IS_MAS_BUILD()
 @class CAContext;
+#endif
 @class CALayer;
 
 namespace ui {
@@ -79,8 +81,10 @@ class ImageTransportSurfaceOverlayMacEGL : public gl::Presenter {
 
   base::WeakPtr<ImageTransportSurfaceDelegate> delegate_;
 
+#if !IS_MAS_BUILD()
   const bool use_remote_layer_api_;
   CAContext* __strong 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 34931ae06d7923aff611b384730ca2edb7e866e9..1973b90a04bcbd21059b82a0969d3ff1ce8dcd0a 100644
--- a/gpu/ipc/service/image_transport_surface_overlay_mac.mm
+++ b/gpu/ipc/service/image_transport_surface_overlay_mac.mm
@@ -54,12 +54,15 @@
 ImageTransportSurfaceOverlayMacEGL::ImageTransportSurfaceOverlayMacEGL(
     base::WeakPtr<ImageTransportSurfaceDelegate> delegate)
     : delegate_(delegate),
+#if !IS_MAS_BUILD()
       use_remote_layer_api_(ui::RemoteLayerAPISupported()),
+#endif
       scale_factor_(1),
       weak_ptr_factory_(this) {
   static bool av_disabled_at_command_line =
       !base::FeatureList::IsEnabled(kAVFoundationOverlays);
 
+#if !IS_MAS_BUILD()
   ca_layer_tree_coordinator_ = std::make_unique<ui::CALayerTreeCoordinator>(
       use_remote_layer_api_, !av_disabled_at_command_line);
 
@@ -80,6 +83,10 @@
 #endif
     ca_context_.layer = ca_layer_tree_coordinator_->GetCALayerForDisplay();
   }
+#else
+  ca_layer_tree_coordinator_ = std::make_unique<ui::CALayerTreeCoordinator>(
+      /*allow_remote_layers=*/false, !av_disabled_at_command_line);
+#endif
 }
 
 ImageTransportSurfaceOverlayMacEGL::~ImageTransportSurfaceOverlayMacEGL() {
@@ -197,9 +204,13 @@
     TRACE_EVENT_INSTANT2("test_gpu", "SwapBuffers", TRACE_EVENT_SCOPE_THREAD,
                          "GLImpl", static_cast<int>(gl::GetGLImplementation()),
                          "width", pixel_size_.width());
+#if !IS_MAS_BUILD()
     if (use_remote_layer_api_) {
       params.ca_context_id = [ca_context_ contextId];
     } else {
+#else
+    if (true) {
+#endif
       IOSurfaceRef io_surface =
           ca_layer_tree_coordinator_->GetIOSurfaceForDisplay();
       if (io_surface) {
diff --git a/ui/accelerated_widget_mac/display_ca_layer_tree.mm b/ui/accelerated_widget_mac/display_ca_layer_tree.mm
index dcf493d62990018040a3f84b6f875af737bd2214..6ffffe8b3946e0427aead8be19878c537c841294 100644
--- a/ui/accelerated_widget_mac/display_ca_layer_tree.mm
+++ b/ui/accelerated_widget_mac/display_ca_layer_tree.mm
@@ -121,6 +121,7 @@ - (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;
@@ -150,6 +151,9 @@ - (void)setContentsChanged;
     [io_surface_layer_ removeFromSuperlayer];
     io_surface_layer_ = nil;
   }
+#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 59dc2f82214cfd883b6ebef3b0fb25af6387a9cd..d585ba14b34021a93c878d0d9f9d9ef70eed32ca 100644
--- a/ui/base/cocoa/remote_layer_api.h
+++ b/ui/base/cocoa/remote_layer_api.h
@@ -17,6 +17,7 @@
 
 #if BUILDFLAG(IS_MAC)
 
+#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.
@@ -68,6 +69,8 @@ extern NSString* const kCAContextIgnoresHitTest;
 
 #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 fc25ba79d2b0e1acdb7ba54b89e7d6e16f94771b..962df2d65d61ec0836cf465d847eb666033846f2 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;
 
@@ -55,6 +58,9 @@ bool RemoteLayerAPISupported() {
 
   // If everything is there, we should be able to use the API.
   return true;
+#else
+  return false;
+#endif  // MAS_BUILD
 }
 
 }  // namespace