Add Blink setting to block doc.written scripts on 2g-like networks

components/test_runner/test_runner.h

Index: components/test_runner/test_runner.h
diff --git a/components/test_runner/test_runner.h b/components/test_runner/test_runner.h
index 856dc80020deffcc06053a475a8a50075afe40a8..9be952257a5662262c41614d365a5d201bd0fa7e 100644
--- a/components/test_runner/test_runner.h
+++ b/components/test_runner/test_runner.h
@@ -18,6 +18,7 @@
 #include "components/test_runner/layout_test_runtime_flags.h"
 #include "components/test_runner/test_runner_export.h"
 #include "components/test_runner/web_test_runner.h"
+#include "third_party/WebKit/public/platform/WebEffectiveConnectionType.h"
 #include "third_party/WebKit/public/platform/WebImage.h"
 #include "v8/include/v8.h"
 
@@ -168,6 +169,10 @@ class TestRunner : public WebTestRunner {
 
   bool ShouldDumpConsoleMessages() const;
 
+  blink::WebEffectiveConnectionType effective_connection_type() const {
+    return effective_connection_type_;
+  }
+
   // A single item in the work queue.
   class WorkItem {
    public:
@@ -462,6 +467,12 @@ class TestRunner : public WebTestRunner {
   // to test output.
   void SetDumpConsoleMessages(bool value);
 
+  // Overrides the NetworkQualityEstimator's estimated network type. If |type|
+  // is TypeUnknown the NQE's value is used. Be sure to call this with
+  // TypeUnknown at the end of your test if you use this.
+  void SetEffectiveConnectionType(
+      blink::WebEffectiveConnectionType connection_type);
+
   // Controls whether the mock spell checker is enabled.
   void SetMockSpellCheckerEnabled(bool enabled);
 
@@ -640,6 +651,9 @@ class TestRunner : public WebTestRunner {
   // True if we run a test in LayoutTests/imported/{csswg-test,wpt}/.
   bool is_web_platform_tests_mode_;
 
+  // An effective connection type settable by layout tests.
+  blink::WebEffectiveConnectionType effective_connection_type_;
+
   base::WeakPtrFactory<TestRunner> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TestRunner);