Consistently use LoFi for an entire page

content/common/navigation_params.h

Index: content/common/navigation_params.h
diff --git a/content/common/navigation_params.h b/content/common/navigation_params.h
index 37b1af035401ee8e9ab394831888b68c6519e4e9..ba2155e6d783b68a57afb634e640c4296a09c05f 100644
--- a/content/common/navigation_params.h
+++ b/content/common/navigation_params.h
@@ -22,6 +22,17 @@ class RefCountedMemory;
 
 namespace content {
 
+// The LoFi state which determines whether to add the LoFi header. Must stay in
+// sync with the enum in url_request.h.
+enum LoFiState {
+  // Request a LoFi version of the resource.
+  LOFI_ON = 0,
+  // Request a normal (non-LoFi) version of the resource.
+  LOFI_OFF,
+  // Let the browser process decide whether or not to request the LoFi version.
+  LOFI_DEFAULT,
+};
+
 // PlzNavigate
 // Helper function to determine if the navigation to |url| should make a request
 // to the network stack. A request should not be sent for data URLs, JavaScript
@@ -257,6 +268,10 @@ struct CONTENT_EXPORT RequestNavigationParams {
   // needs to notify the browser that the clearing was succesful when the
   // navigation commits.
   bool should_clear_history_list;
+
+  // Whether or not to request a LoFi version of the document or let the browser
+  // decide.
+  LoFiState lofi_state;
 };
 
 // Helper struct keeping track in one place of all the parameters the browser