ozone: Introduce ClientPixmap and ClientPixmapFactory for non-GPU processes.

ui/ozone/platform/caca/ozone_platform_caca.cc

Index: ui/ozone/platform/caca/ozone_platform_caca.cc
diff --git a/ui/ozone/platform/caca/ozone_platform_caca.cc b/ui/ozone/platform/caca/ozone_platform_caca.cc
index fdfebe22402d4d149a200af974b1767513610402..5e01fd51021c51247f2f65a2df555e4ab540e851 100644
--- a/ui/ozone/platform/caca/ozone_platform_caca.cc
+++ b/ui/ozone/platform/caca/ozone_platform_caca.cc
@@ -4,6 +4,7 @@
 
 #include "ui/ozone/platform/caca/ozone_platform_caca.h"
 
+#include "base/file_descriptor_posix.h"
 #include "ui/events/ozone/layout/keyboard_layout_engine_manager.h"
 #include "ui/events/ozone/layout/no/no_keyboard_layout_engine.h"
 #include "ui/ozone/common/native_display_delegate_ozone.h"
@@ -15,6 +16,7 @@
 #include "ui/ozone/public/gpu_platform_support.h"
 #include "ui/ozone/public/gpu_platform_support_host.h"
 #include "ui/ozone/public/input_controller.h"
+#include "ui/ozone/public/native_pixmap_manager.h"
 #include "ui/ozone/public/ozone_platform.h"
 #include "ui/ozone/public/system_input_injector.h"
 
@@ -62,6 +64,10 @@ class OzonePlatformCaca : public OzonePlatform {
     return make_scoped_ptr(new NativeDisplayDelegateOzone());
   }
 
+  base::FileDescriptor GetVirtualDeviceFd() override {
+    return base::FileDescriptor();
+  }
+
   void InitializeUI() override {
     window_manager_.reset(new CacaWindowManager);
     overlay_manager_.reset(new StubOverlayManager());
@@ -95,4 +101,8 @@ OzonePlatform* CreateOzonePlatformCaca() {
   return new OzonePlatformCaca;
 }
 
+NativePixmapManager* CreateNativePixmapManagerCaca() {
+  return CreateStubNativePixmapManager();
+}
+
 }  // namespace ui