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 a0186a6a77d480f427a9285936606a17d6d2c17a..42b53d01c882a46f52fbe340a2069dee4f002fba 100644
--- a/ui/ozone/platform/caca/ozone_platform_caca.cc
+++ b/ui/ozone/platform/caca/ozone_platform_caca.cc
@@ -14,7 +14,9 @@
 #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/ozone_client.h"
 #include "ui/ozone/public/ozone_platform.h"
+#include "ui/ozone/public/surface_client_factory_ozone.h"
 #include "ui/ozone/public/system_input_injector.h"
 
 namespace ui {
@@ -83,10 +85,40 @@ class OzonePlatformCaca : public OzonePlatform {
   DISALLOW_COPY_AND_ASSIGN(OzonePlatformCaca);
 };
 
+class OzoneClientCaca : public OzoneClient {
+ public:
+  OzoneClientCaca() {}
+  ~OzoneClientCaca() override {}
+
+  // OzoneClient:
+  SurfaceClientFactoryOzone* GetSurfaceClientFactoryOzone() override {
+    return surface_client_.get();
+  }
+
+  void InitializeUI() override {
+    if (!surface_client_)
+      surface_client_.reset(new SurfaceClientFactoryOzone);
+  }
+
+  void InitializeRenderer() override {
+    if (!surface_client_)
+      surface_client_.reset(new SurfaceClientFactoryOzone);
+  }
+
+ private:
+  scoped_ptr<SurfaceClientFactoryOzone> surface_client_;
+
+  DISALLOW_COPY_AND_ASSIGN(OzoneClientCaca);
+};
+
 }  // namespace
 
 OzonePlatform* CreateOzonePlatformCaca() {
   return new OzonePlatformCaca;
 }
 
+OzoneClient* CreateOzoneClientCaca() {
+  return new OzoneClientCaca;
+}
+
 }  // namespace ui