Make blink_headers depend on mojo_bindings

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 fd1e6e096fd01467f3289dad05311de72e3252b5..b44ddd7458de35e4356ef26c38ae2e19a76137ca 100644
--- a/third_party/WebKit/public/BUILD.gn
+++ b/third_party/WebKit/public/BUILD.gn
@@ -129,6 +129,9 @@ source_set("blink_headers") {
     "//third_party/icu:icu_config",
   ]
   sources = blink_headers_values.blink_public_sources
+  deps = [
+    ":generate_mojo_bindings",
+  ]
 }
 
 # GYP version: WebKit/public/blink_devtools.gyp:blink_devtools_frontend_resources
@@ -209,3 +212,10 @@ if (is_android) {
     ]
   }
 }
+
+group("generate_mojo_bindings") {
+  deps = [
+    ":mojo_bindings__generator",
+    ":mojo_bindings_blink__generator",
+  ]
+}