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

content/browser/BUILD.gn

Index: content/browser/BUILD.gn
diff --git a/content/browser/BUILD.gn b/content/browser/BUILD.gn
index 2b5c7c23cf2e59939817931a804b11cb9b93e061..bec77974e2767007a2034bd802c4f7e5009dfcb4 100644
--- a/content/browser/BUILD.gn
+++ b/content/browser/BUILD.gn
@@ -458,6 +458,8 @@ source_set("browser") {
         "compositor/browser_compositor_overlay_candidate_validator_ozone.h",
         "compositor/software_output_device_ozone.cc",
         "compositor/software_output_device_ozone.h",
+        "gpu/browser_native_pixmap_manager_ozone.cc",
+        "gpu/browser_native_pixmap_manager_ozone.h",
       ]
     }
     deps += [ "//ui/compositor" ]