Add visibility restrictions to all mojoms that export symbols.

third_party/WebKit/public/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/buildflag_header.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//third_party/WebKit/public/public_features.gni")
 import("//third_party/WebKit/Source/config.gni")
 import("//third_party/WebKit/Source/core/core.gni")
 import("//tools/grit/grit_rule.gni")
@@ skipping 622 matching lines @@
   use_qualified_include = true
   source = "blink_image_resources.grd"
   outputs = [
     "grit/blink_image_resources.h",
     "blink_image_resources_100_percent.pak",
     "blink_image_resources_200_percent.pak",
   ]
 }
 
 mojom("mojo_bindings") {
+  visibility = [ "//content/*" ]
+  visibility_blink = [
+    "//content/common:mojo_bindings_blink",
+    "//third_party/WebKit/Source/platform",
+  ]
   sources = [
     "platform/mime_registry.mojom",
     "platform/modules/app_banner/app_banner.mojom",
     "platform/modules/background_sync/background_sync.mojom",
     "platform/modules/bluetooth/web_bluetooth.mojom",
     "platform/modules/broadcastchannel/broadcast_channel.mojom",
     "platform/modules/budget_service/budget_service.mojom",
     "platform/modules/hyphenation/hyphenation.mojom",
     "platform/modules/mediasession/media_session.mojom",
     "platform/modules/notifications/notification.mojom",
@@ skipping 29 matching lines @@
   export_header = "content/common/content_export.h"
 
   # Similarly, the blink variant must be linked with the platform component
   # since it uses types from it in its typemaps.
   export_class_attribute_blink = "BLINK_PLATFORM_EXPORT"
   export_define_blink = "BLINK_PLATFORM_IMPLEMENTATION=1"
   export_header_blink = "third_party/WebKit/public/platform/WebCommon.h"
 }
 
 mojom("android_mojo_bindings") {
+  visibility = [ ":mojo_bindings" ]
+  visibility_blink = [ ":mojo_bindings_blink" ]
   sources = [
     "platform/modules/installation/installation.mojom",
     "platform/modules/webshare/webshare.mojom",
   ]
   public_deps = [
     "//components/payments:payment_request",
     "//url/mojo:url_mojom_gurl",
   ]
 
   # 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"
 }
 
 # The offscreen_canvas_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("offscreen_canvas_mojo_bindings") {
+  visibility = [ "//content/*" ]
+  visibility_blink = [ "//third_party/WebKit/Source/platform" ]
   sources = [
     "platform/modules/offscreencanvas/offscreen_canvas_surface.mojom",
   ]
   deps = [
     "//cc/ipc:interfaces",
   ]
 
   # See comment above
   export_class_attribute = "CONTENT_EXPORT"
   export_define = "CONTENT_IMPLEMENTATION=1"
@@ skipping 16 matching lines @@
 # relegated to a separate target to avoid duplication between the variants.
 source_set("shared_typemap_traits") {
   visibility = [ ":*" ]
   sources = [
     "web/WindowFeaturesStructTraits.cpp",
   ]
   deps = [
     ":mojo_bindings_shared__generator",
   ]
 }