Make WebView work for external displays (over Presentations).

content/browser/renderer_host/compositor_impl_android.cc

Index: content/browser/renderer_host/compositor_impl_android.cc
diff --git a/content/browser/renderer_host/compositor_impl_android.cc b/content/browser/renderer_host/compositor_impl_android.cc
index 9440da58aa1993f57caa7e4bece56aef9edc957f..a26dbbc1e1a078485dc7351dc19701d18d6f6f4d 100644
--- a/content/browser/renderer_host/compositor_impl_android.cc
+++ b/content/browser/renderer_host/compositor_impl_android.cc
@@ -218,7 +218,8 @@ scoped_ptr<cc::SurfaceIdAllocator> CompositorImpl::CreateSurfaceIdAllocator() {
 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),
@@ -543,10 +544,12 @@ 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() *
@@ -644,7 +647,8 @@ void CompositorImpl::CreateOutputSurface() {
   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());