refactor: use v8 serialization for ipc (#20214)

* refactor: use v8 serialization for ipc

* cloning process.env doesn't work

* serialize host objects by enumerating key/values

* new serialization can handle NaN, Infinity, and undefined correctly

* can't allocate v8 objects during GC

* backport microtasks fix

* fix compile

* fix node_stream_loader reentrancy

* update subframe spec to expect undefined instead of null

* write undefined instead of crashing when serializing host objects

* fix webview spec

* fix download spec

* buffers are transformed into uint8arrays

* can't serialize promises

* fix chrome.i18n.getMessage

* fix devtools tests

* fix zoom test

* fix debug build

* fix lint

* update ipcRenderer tests

* fix printToPDF test

* update patch

* remove accidentally re-added remote-side spec

* wip

* don't attempt to serialize host objects

* jump through different hoops to set options.webContents sometimes

* whoops

* fix lint

* clean up error-handling logic

* fix memory leak

* fix lint

* convert host objects using old base::Value serialization

* fix lint more

* fall back to base::Value-based serialization

* remove commented-out code

* add docs to breaking-changes.md

* Update breaking-changes.md

* update ipcRenderer and WebContents docs

* lint

* use named values for format tag

* save a memcpy for ~30% speedup

* get rid of calls to ShallowClone

* extra debugging for paranoia

* d'oh, use the correct named tags

* apparently msstl doesn't like this DCHECK

* funny story about that DCHECK

* disable remote-related functions when enable_remote_module = false

* nits

* use EnableIf to disable remote methods in mojom

* fix include

* review comments

patches/chromium/.patches

@@ -78,4 +78,5 @@ expose_setuseragent_on_networkcontext.patch
 feat_add_set_theme_source_to_allow_apps_to.patch
 revert_cleanup_remove_menu_subtitles_sublabels.patch
 ui_views_fix_jumbo_build.patch
+export_fetchapi_mojo_traits_to_fix_component_build.patch
 fix_windows_build.patch

patches/chromium/export_fetchapi_mojo_traits_to_fix_component_build.patch

@@ -0,0 +1,36 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Jeremy Apthorp <jeremya@chromium.org>
+Date: Fri, 20 Sep 2019 16:44:18 -0400
+Subject: export FetchAPI mojo traits to fix component build
+
+Without these, we get link errors in the component build when using the
+blink::CloneableMessage mojo traits.
+
+diff --git a/third_party/blink/public/common/fetch/fetch_api_request_body_mojom_traits.h b/third_party/blink/public/common/fetch/fetch_api_request_body_mojom_traits.h
+index 1ddfc2108f9a0104247ea2559b597552cd20a342..f9a10b5b428e29a8824b87616f19292b38e38024 100644
+--- a/third_party/blink/public/common/fetch/fetch_api_request_body_mojom_traits.h
++++ b/third_party/blink/public/common/fetch/fetch_api_request_body_mojom_traits.h
+@@ -11,12 +11,13 @@
+ #include "mojo/public/cpp/bindings/pending_remote.h"
+ #include "services/network/public/cpp/resource_request_body.h"
+ #include "services/network/public/mojom/url_loader.mojom-forward.h"
++#include "third_party/blink/public/common/common_export.h"
+ #include "third_party/blink/public/mojom/fetch/fetch_api_request.mojom-forward.h"
+ 
+ namespace mojo {
+ 
+ template <>
+-struct StructTraits<blink::mojom::FetchAPIRequestBodyDataView,
++struct BLINK_COMMON_EXPORT StructTraits<blink::mojom::FetchAPIRequestBodyDataView,
+                     scoped_refptr<network::ResourceRequestBody>> {
+   static bool IsNull(const scoped_refptr<network::ResourceRequestBody>& r) {
+     return !r;
+@@ -46,7 +47,7 @@ struct StructTraits<blink::mojom::FetchAPIRequestBodyDataView,
+ };
+ 
+ template <>
+-struct StructTraits<blink::mojom::FetchAPIDataElementDataView,
++struct BLINK_COMMON_EXPORT StructTraits<blink::mojom::FetchAPIDataElementDataView,
+                     network::DataElement> {
+   static const network::mojom::DataElementType& type(
+       const network::DataElement& element) {

patches/chromium/gin_with_namespace.patch

@@ -12,7 +12,7 @@ native_mate, and we should remove this patch once native_mate is erased
 from Electron.
 
 diff --git a/gin/arguments.h b/gin/arguments.h
-index eaded13e2991..03e1495566d1 100644
+index eaded13e29919793494dfe2f7f85fad7dcb125cf..03e1495566d1ab561dcd67517053173911288cea 100644
 --- a/gin/arguments.h
 +++ b/gin/arguments.h
 @@ -28,14 +28,14 @@ class GIN_EXPORT Arguments {
@@ -60,7 +60,7 @@ index eaded13e2991..03e1495566d1 100644
      (is_for_property_ ? info_for_property_->GetReturnValue()
                        : info_for_function_->GetReturnValue())
 diff --git a/gin/converter.h b/gin/converter.h
-index 27b4d0acd016..b19209a8534a 100644
+index 27b4d0acd016df378e4cb44ccda1a433244fe2c6..b19209a8534a497373c5a2f861b26502e96144c9 100644
 --- a/gin/converter.h
 +++ b/gin/converter.h
 @@ -250,7 +250,7 @@ std::enable_if_t<ToV8ReturnsMaybe<T>::value, bool> TryConvertToV8(