WIP POC blob transport over mojo

third_party/WebKit/public/BUILD.gn

Index: third_party/WebKit/public/BUILD.gn
diff --git a/third_party/WebKit/public/BUILD.gn b/third_party/WebKit/public/BUILD.gn
index 59cd4bcac46b08af0cf72f75fcf0a8fd3aec5ac3..e82e1ec51917d9d156e59079d908dc3b8b1eb177 100644
--- a/third_party/WebKit/public/BUILD.gn
+++ b/third_party/WebKit/public/BUILD.gn
@@ -731,6 +731,7 @@ mojom("mojo_bindings") {
   ]
   public_deps = [
     ":android_mojo_bindings",
+    ":blob_mojo_bindings",
     "//device/bluetooth/public/interfaces",
     "//mojo/common:common_custom_types",
     "//ui/gfx/geometry/mojo",
@@ -810,8 +811,42 @@ mojom("offscreen_canvas_mojo_bindings") {
   export_header_blink = "third_party/WebKit/public/platform/WebCommon.h"
 }
 
+# The blob_mojo_bindings is separated from the rest of mojom files
+# because its deps contain too many files in Chromium that would pollute the
+# include paths in generated mojom-blink files for other services.
+mojom("blob_mojo_bindings") {
+  visibility = [
+    "//content/*",
+    "//storage/*",
+    ":mojo_bindings",
+  ]
+  visibility_blink = [
+    "//third_party/WebKit/Source/platform",
+    "//content/common:mojo_bindings_blink",
+    ":mojo_bindings_blink",
+  ]
+  sources = [
+    "platform/blobs.mojom",
+  ]
+  deps = [
+    "//mojo/common:common_custom_types",
+    "//url/mojo:url_mojom_gurl",
+  ]
+
+  component_output_prefix = "blink_blob_mojo_bindings"
+
+  # See comment above
+  export_class_attribute = "CONTENT_EXPORT"
+  export_define = "CONTENT_IMPLEMENTATION=1"
+  export_header = "content/common/content_export.h"
+  export_class_attribute_blink = "BLINK_PLATFORM_EXPORT"
+  export_define_blink = "BLINK_PLATFORM_IMPLEMENTATION=1"
+  export_header_blink = "third_party/WebKit/public/platform/WebCommon.h"
+}
+
 group("generate_mojo_bindings") {
   deps = [
+    ":blob_mojo_bindings_blink__generator",
     ":mojo_bindings_blink__generator",
     ":offscreen_canvas_mojo_bindings_blink__generator",
   ]