Make WebView work for external displays (over Presentations).

content/browser/renderer_host/compositor_impl_android.cc

 // 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.
 
 #include "content/browser/renderer_host/compositor_impl_android.h"
 
 #include <android/bitmap.h>
 #include <android/native_window_jni.h>
 
 #include "base/android/jni_android.h"
@@ skipping 200 matching lines @@
       new cc::SurfaceIdAllocator(++g_surface_id_namespace));
   cc::SurfaceManager* manager = GetSurfaceManager();
   DCHECK(manager);
   allocator->RegisterSurfaceIdNamespace(manager);
   return allocator.Pass();
 }
 
 CompositorImpl::CompositorImpl(CompositorClient* client,
                                gfx::NativeWindow root_window)
     : root_layer_(cc::Layer::Create(Compositor::LayerSettings())),
-      resource_manager_(&ui_resource_provider_),
+      resource_manager_(&ui_resource_provider_,
+                        root_window->GetJavaContext().obj()),
       surface_id_allocator_(GetSurfaceManager() ? CreateSurfaceIdAllocator()
                                                 : nullptr),
       has_transparent_background_(false),
       device_scale_factor_(1),
       window_(NULL),
       surface_id_(0),
       client_(client),
       root_window_(root_window),
       did_post_swapbuffers_(false),
       ignore_schedule_composite_(false),
@@ skipping 304 matching lines @@
   DCHECK(!needs_composite_ || WillComposite());
 
   needs_composite_ = true;
   PostComposite(COMPOSITE_IMMEDIATELY);
 }
 
 static scoped_ptr<WebGraphicsContext3DCommandBufferImpl>
 CreateGpuProcessViewContext(
     const scoped_refptr<GpuChannelHost>& gpu_channel_host,
     const blink::WebGraphicsContext3D::Attributes attributes,
-    int surface_id) {
+    int surface_id,
+    gfx::NativeWindow nativeWindow) {

[jdduke (slow), 2015/07/15 16:03:07]

Hmm, what about passing it in as "const ui::WindowAndroid&"?

   GURL url("chrome://gpu/Compositor::createContext3D");
   static const size_t kBytesPerPixel = 4;
-  gfx::DeviceDisplayInfo display_info;
+  const gfx::DeviceDisplayInfo& display_info =
+      nativeWindow->GetDeviceDisplayInfo();
   size_t full_screen_texture_size_in_bytes =
       display_info.GetDisplayHeight() *
       display_info.GetDisplayWidth() *
       kBytesPerPixel;
   WebGraphicsContext3DCommandBufferImpl::SharedMemoryLimits limits;
   limits.command_buffer_size = 64 * 1024;
   limits.start_transfer_buffer_size = 64 * 1024;
   limits.min_transfer_buffer_size = 64 * 1024;
   limits.max_transfer_buffer_size = std::min(
       3 * full_screen_texture_size_in_bytes, kDefaultMaxTransferBufferSize);
@@ skipping 77 matching lines @@
 
   BrowserGpuChannelHostFactory* factory =
       BrowserGpuChannelHostFactory::instance();
   // This channel might be lost (and even if it isn't right now, it might
   // still get marked as lost from the IO thread, at any point in time really).
   // But from here on just try and always lead to either
   // DidInitializeOutputSurface() or DidFailToInitializeOutputSurface().
   scoped_refptr<GpuChannelHost> gpu_channel_host(factory->GetGpuChannel());
   scoped_refptr<ContextProviderCommandBuffer> context_provider(
       ContextProviderCommandBuffer::Create(
-          CreateGpuProcessViewContext(gpu_channel_host, attrs, surface_id_),
+          CreateGpuProcessViewContext(gpu_channel_host, attrs, surface_id_,
+                                      root_window_),
           BROWSER_COMPOSITOR_ONSCREEN_CONTEXT));
   DCHECK(context_provider.get());
 
   scoped_ptr<cc::OutputSurface> real_output_surface(
       new OutputSurfaceWithoutParent(
           context_provider, base::Bind(&CompositorImpl::PopulateGpuCapabilities,
                                        base::Unretained(this))));
 
   cc::SurfaceManager* manager = GetSurfaceManager();
   if (manager) {
@@ skipping 105 matching lines @@
 
 void CompositorImpl::SetNeedsAnimate() {
   needs_animate_ = true;
   if (!host_)
     return;
 
   host_->SetNeedsAnimate();
 }
 
 }  // namespace content