Add missing deps to v8 binding test target to fix random build failures.

Random failures encountered so far can be reproduced by compiling
third_party/blink/renderer/bindings/core/v8:testing target on clean repo.

Change-Id: If92737cdfdc6f12533776b6ded935ac1a2689137
Reviewed-on: https://chromium-review.googlesource.com/1127040
Commit-Queue: Marek Haranczyk <mharanczyk@opera.com>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577137}

third_party/blink/public/BUILD.gn

@@ -893,6 +893,10 @@ group("generate_mojo_bindings") {
     ":media_devices_mojo_bindings_blink__generator",
     ":mojo_bindings__generator",
     ":mojo_bindings_blink__generator",
+    "mojom:mojom_core__generator",
+    "mojom:mojom_core_blink__generator",
+    "mojom:mojom_platform__generator",
+    "mojom:mojom_platform_blink__generator",
   ]
 }
 

third_party/blink/renderer/bindings/core/v8/BUILD.gn

@@ -257,8 +257,10 @@ source_set("testing") {
              [ "//third_party/blink/renderer/core:config" ]
 
   deps = [
-    ":bindings_core_impl_generated",
+    ":bindings_core_v8_generated",
     "//skia",
+    "//third_party/blink/public:generate_mojo_bindings",
+    "//third_party/blink/renderer/core:all_generators",
     "//third_party/blink/renderer/platform",
     "//v8",
   ]