PlzNavigate: Do not send synchronous navigations from the renderer to the browser.

content/common/navigation_params.cc

Index: content/common/navigation_params.cc
diff --git a/content/common/navigation_params.cc b/content/common/navigation_params.cc
index 8b70c8ffb9718acfc22352f71d3643591cad57c7..b9cd7d36e5166b9e1e0faada4dcd9ed6850667c9 100644
--- a/content/common/navigation_params.cc
+++ b/content/common/navigation_params.cc
@@ -4,10 +4,25 @@
 
 #include "content/common/navigation_params.h"
 
+#include "base/command_line.h"
 #include "base/memory/ref_counted_memory.h"
+#include "content/public/common/content_switches.h"
 
 namespace content {
 
+// PlzNavigate
+bool ShouldMakeNetworkRequestForURL(const GURL& url) {
+  CHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableBrowserSideNavigation));
+
+  // Data URLs, Javascript URLs and about:blank should not send a request to the
+  // network stack.
+  // TODO(clamy): same document navigations should not send requests to the
+  // network stack. Neither should pushState/popState.
+  return !url.SchemeIs(url::kDataScheme) && url != GURL(url::kAboutBlankURL) &&
+         !url.SchemeIs(url::kJavaScriptScheme);
+}
+
 CommonNavigationParams::CommonNavigationParams()
     : transition(ui::PAGE_TRANSITION_LINK),
       navigation_type(FrameMsg_Navigate_Type::NORMAL),