Update comments for parameterized feature policy

In content/public/browser/render_frame_host.h to make it clear
how feature values are compared.

TBR: kinuko, iclelland

Change-Id: Iaee687abe3f49e4c2274fe158fd5ce4fd6151d2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1504295
Auto-Submit: Luna Lu <loonybear@chromium.org>
Reviewed-by: Luna Lu <loonybear@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638256}

content/public/browser/render_frame_host.h

@@ -300,15 +300,16 @@ class CONTENT_EXPORT RenderFrameHost : public IPC::Listener,
   virtual bool GetSuddenTerminationDisablerState(
       blink::WebSuddenTerminationDisablerType disabler_type) = 0;
 
-  // Returns true if the given Feature Policy |feature| is enabled for this
-  // RenderFrameHost and is allowed to be used by it. Use this in the browser
-  // process to determine whether access to a feature is allowed.
-  virtual bool IsFeatureEnabled(blink::mojom::FeaturePolicyFeature feature) = 0;
-  // Returns true if the given |threshold_value| is above the threshold value
-  // specified in the policy for |feature| for this RenderFrameHost. Use this
-  // in the browser process to determine whether access to a feature is allowed.
+  // Returns true if the given |threshold_value| is below the threshold value
+  // specified in the policy for |feature| for this RenderFrameHost. See
+  // third_party/blink/public/common/feature_policy/feature_policy.h for how to
+  // compare values of different types. Use this in the browser process to
+  // determine whether access to a feature is allowed.
   virtual bool IsFeatureEnabled(blink::mojom::FeaturePolicyFeature feature,
                                 blink::PolicyValue threshold_value) = 0;
+  // Same as above, with |threshold_value| set to the max value the given
+  // |feature| can have.
+  virtual bool IsFeatureEnabled(blink::mojom::FeaturePolicyFeature feature) = 0;
 
   // Opens view-source tab for the document last committed in this
   // RenderFrameHost.