DevTools: disable compilation cache for inspector tests to reduce flakiness.

components/test_runner/test_runner.cc

Index: components/test_runner/test_runner.cc
diff --git a/components/test_runner/test_runner.cc b/components/test_runner/test_runner.cc
index e24c5b030855d78fd5bbd7356859d2c72d2c119a..dbbc994badcd66599e81ea9ba17dffc2a3aa1550 100644
--- a/components/test_runner/test_runner.cc
+++ b/components/test_runner/test_runner.cc
@@ -1626,6 +1626,8 @@ void TestRunner::SetDelegate(WebTestDelegate* delegate) {
 
 void TestRunner::SetMainView(WebView* web_view) {
   main_view_ = web_view;
+  if (disable_v8_cache_)
+    SetV8CacheDisabled(true);
 }
 
 void TestRunner::Reset() {
@@ -1965,6 +1967,16 @@ void TestRunner::ClearDevToolsLocalStorage() {
   delegate_->ClearDevToolsLocalStorage();
 }
 
+void TestRunner::SetV8CacheDisabled(bool disabled) {
+  if (!main_view_) {
+    disable_v8_cache_ = disabled;
+    return;
+  }
+  main_view_->settings()->setV8CacheOptions(disabled ?
+      blink::WebSettings::V8CacheOptionsNone :
+      blink::WebSettings::V8CacheOptionsDefault);
+}
+
 void TestRunner::ShowDevTools(const std::string& settings,
                               const std::string& frontend_url) {
   delegate_->ShowDevTools(settings, frontend_url);