linux: add accelerated compositing.

Similar to Windows, this doesn't handle exposes currently, nor WebGL.
Other caveat: tearing off a tab causes trouble to the gpu process.

Review URL: http://codereview.chromium.org/2886003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@51324 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 16 insertions, 10 deletions

diff --git a/chrome/gpu/gpu_channel.cc b/chrome/gpu/gpu_channel.cc
index b775acf..c0470f7 100644
--- a/chrome/gpu/gpu_channel.cc
+++ b/chrome/gpu/gpu_channel.cc
@@ -137,6 +137,7 @@ void GpuChannel::OnCreateViewCommandBuffer(gfx::NativeViewId view_id,
 
 #if defined(ENABLE_GPU)
 
+  gfx::PluginWindowHandle handle = NULL;
 #if defined(OS_WIN)
   gfx::NativeView view = gfx::NativeViewFromId(view_id);
 
@@ -146,17 +147,25 @@ void GpuChannel::OnCreateViewCommandBuffer(gfx::NativeViewId view_id,
       GetProp(view, chrome::kChromiumRendererIdProperty));
   if (view_renderer_id != renderer_id_)
     return;
+  handle = view;
+#elif defined(OS_LINUX)
+  ChildThread* gpu_thread = ChildThread::current();
+  // Ask the browser for the view's XID.
+  // TODO(piman): This assumes that it doesn't change. It can change however
+  // when tearing off tabs. This needs a fix in the browser UI code. A possible
+  // alternative would be to add a socket/plug pair like with plugins but that
+  // has issues with events and focus.
+  gpu_thread->Send(new GpuHostMsg_GetViewXID(view_id, &handle));
 #else
   // TODO(apatrick): This needs to be something valid for mac and linux.
   // Offscreen rendering will work on these platforms but not rendering to the
   // window.
   DCHECK_EQ(view_id, 0);
-  gfx::NativeView view = 0;
 #endif
 
   *route_id = GenerateRouteID();
   scoped_refptr<GpuCommandBufferStub> stub = new GpuCommandBufferStub(
-      this, view, NULL, gfx::Size(), 0, *route_id);
+      this, handle, NULL, gfx::Size(), 0, *route_id);
   router_.AddRoute(*route_id, stub);
   stubs_[*route_id] = stub;
 #endif  // ENABLE_GPU
diff --git a/chrome/gpu/gpu_command_buffer_stub.cc b/chrome/gpu/gpu_command_buffer_stub.cc
index a95b4c1..ee9d937 100644
--- a/chrome/gpu/gpu_command_buffer_stub.cc
+++ b/chrome/gpu/gpu_command_buffer_stub.cc
@@ -14,13 +14,13 @@
 using gpu::Buffer;
 
 GpuCommandBufferStub::GpuCommandBufferStub(GpuChannel* channel,
-                                           gfx::NativeView view,
+                                           gfx::PluginWindowHandle handle,
                                            GpuCommandBufferStub* parent,
                                            const gfx::Size& size,
                                            uint32 parent_texture_id,
                                            int32 route_id)
     : channel_(channel),
-      view_(view),
+      handle_(handle),
       parent_(parent),
       initial_size_(size),
       parent_texture_id_(parent_texture_id),
@@ -73,11 +73,8 @@ void GpuCommandBufferStub::OnInitialize(
           parent_ ? parent_->processor_.get() : NULL;
       processor_.reset(new gpu::GPUProcessor(command_buffer_.get()));
       // TODO(apatrick): The reinterpret_cast below is only valid on windows.
-#if !defined(OS_WIN)
-      DCHECK_EQ(view_, static_cast<gfx::NativeView>(0));
-#endif
       if (processor_->Initialize(
-          reinterpret_cast<gfx::PluginWindowHandle>(view_),
+          handle_,
           initial_size_,
           parent_processor,
           parent_texture_id_)) {
diff --git a/chrome/gpu/gpu_command_buffer_stub.h b/chrome/gpu/gpu_command_buffer_stub.h
index 7aaf68a..91d7029 100644
--- a/chrome/gpu/gpu_command_buffer_stub.h
+++ b/chrome/gpu/gpu_command_buffer_stub.h
@@ -24,7 +24,7 @@ class GpuCommandBufferStub
       public base::RefCountedThreadSafe<GpuCommandBufferStub> {
  public:
   GpuCommandBufferStub(GpuChannel* channel,
-                       gfx::NativeView view,
+                       gfx::PluginWindowHandle handle,
                        GpuCommandBufferStub* parent,
                        const gfx::Size& size,
                        uint32 parent_texture_id,
@@ -55,7 +55,7 @@ class GpuCommandBufferStub
   void OnResizeOffscreenFrameBuffer(const gfx::Size& size);
 
   scoped_refptr<GpuChannel> channel_;
-  gfx::NativeView view_;
+  gfx::PluginWindowHandle handle_;
   scoped_refptr<GpuCommandBufferStub> parent_;
   gfx::Size initial_size_;
   uint32 parent_texture_id_;