net: Make net/ work with v8_context_snapshot.bin

We are planning to replace snapshot_blob.bin with v8_context_snapshot.bin.
This CL makes net/ code to load v8_context_snapshot.bin to work with it.

Bug: 789964, 764576
Change-Id: Ifcbe58d632dd76fd4bcc02182044d1e111f4267a
Reviewed-on: https://chromium-review.googlesource.com/810347Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522648}

net/BUILD.gn

@@ -2306,9 +2306,7 @@ static_library("http_server") {
     "server/web_socket_encoder.cc",
     "server/web_socket_encoder.h",
   ]
-  configs += [
-    "//build/config/compiler:wexit_time_destructors",
-  ]
+  configs += [ "//build/config/compiler:wexit_time_destructors" ]
   deps = [
     ":net",
     "//base",
@@ -2660,9 +2658,7 @@ static_library("test_support") {
     "url_request/url_request_test_util.h",
   ]
 
-  configs += [
-    "//build/config:precompiled_headers",
-  ]
+  configs += [ "//build/config:precompiled_headers" ]
 
   public_deps = [
     ":traffic_annotation",
@@ -2769,6 +2765,7 @@ if (use_v8_in_net) {
 
     configs += [
       "//build/config/compiler:wexit_time_destructors",
+      "//tools/v8_context_snapshot:use_v8_context_snapshot",
       "//v8:external_startup_data",
     ]
 
@@ -2779,6 +2776,7 @@ if (use_v8_in_net) {
     deps = [
       "//base",
       "//gin",
+      "//tools/v8_context_snapshot",
       "//url",
       "//v8",
     ]
@@ -5307,9 +5305,7 @@ test("net_unittests") {
   ]
   net_unfiltered_sources = []
 
-  configs += [
-    "//build/config:precompiled_headers",
-  ]
+  configs += [ "//build/config:precompiled_headers" ]
   defines = []
 
   deps = [

net/proxy/proxy_resolver_v8.cc

@@ -375,7 +375,10 @@ class SharedIsolateFactory {
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
         gin::V8Initializer::LoadV8Snapshot();
         gin::V8Initializer::LoadV8Natives();
-#endif
+#ifdef USE_V8_CONTEXT_SNAPSHOT
+        gin::V8Initializer::LoadV8ContextSnapshot();
+#endif  // USE_V8_CONTEXT_SNAPSHOT
+#endif  // V8_USE_EXTERNAL_STARTUP_DATA
 
         // The performance of the proxy resolver is limited by DNS resolution,
         // and not V8, so tune down V8 to use as little memory as possible.