gpu: Remove Create/DeleteImage IPC by adding an X11_PIXMAP_BUFFER GpuMemoryBuffer type.

content/common/gpu/client/gpu_channel_host.cc

Index: content/common/gpu/client/gpu_channel_host.cc
diff --git a/content/common/gpu/client/gpu_channel_host.cc b/content/common/gpu/client/gpu_channel_host.cc
index 6312dee080ca01f9483b4b3e64b28574166ccb85..492e6965b77bcc7f23fbbd9baea1050d9a5d418c 100644
--- a/content/common/gpu/client/gpu_channel_host.cc
+++ b/content/common/gpu/client/gpu_channel_host.cc
@@ -53,6 +53,9 @@ bool GpuChannelHost::IsValidGpuMemoryBuffer(
 #if defined(OS_ANDROID)
     case gfx::SURFACE_TEXTURE_BUFFER:
 #endif
+#if defined(USE_X11)
+    case gfx::X11_PIXMAP_BUFFER:
+#endif
       return true;
     default:
       return false;
@@ -309,6 +312,10 @@ gfx::GpuMemoryBufferHandle GpuChannelHost::ShareGpuMemoryBufferToGpuProcess(
     case gfx::SURFACE_TEXTURE_BUFFER:
       return source_handle;
 #endif
+#if defined(USE_X11)
+    case gfx::X11_PIXMAP_BUFFER:
+      return source_handle;
+#endif
     default:
       NOTREACHED();
       return gfx::GpuMemoryBufferHandle();