Bug 1579269 Part 1: Make the document inRDMPane property set via a new emulation actor method. r=mtigley

Differential Revision: https://phabricator.services.mozilla.com/D51020

--HG--
extra : moz-landing-system : lando

devtools/client/responsive/ui.js

@@ -207,6 +207,10 @@ class ResponsiveUI {
     // Restore the previous state of RDM.
     await this.restoreState();
 
+    if (this.isBrowserUIEnabled) {
+      await this.emulationFront.setDocumentInRDMPane(true);
+    }
+
     if (!this.isBrowserUIEnabled) {
       // Force the newly created Zoom actor to cache its 1.0 zoom level. This
       // prevents it from sending out FullZoomChange events when the content
@@ -302,6 +306,10 @@ class ResponsiveUI {
       await this.inited;
     }
 
+    if (this.isBrowserUIEnabled) {
+      await this.emulationFront.setDocumentInRDMPane(false);
+    }
+
     this.tab.removeEventListener("TabClose", this);
     this.tab.removeEventListener("BeforeTabRemotenessChange", this);
     this.browserWindow.removeEventListener("unload", this);

devtools/server/actors/emulation.js

@@ -460,6 +460,12 @@ const EmulationActor = protocol.ActorClassWithSpec(emulationSpec, {
   async captureScreenshot() {
     return this.screenshotActor.capture({});
   },
+
+  async setDocumentInRDMPane(inRDMPane) {
+    if (this.docShell && this.docShell.document) {
+      this.docShell.document.inRDMPane = inRDMPane;
+    }
+  },
 });
 
 exports.EmulationActor = EmulationActor;

devtools/shared/specs/emulation.js

@@ -179,6 +179,13 @@ const emulationSpec = generateActorSpec({
         value: RetVal("json"),
       },
     },
+
+    setDocumentInRDMPane: {
+      request: {
+        state: Arg(0, "boolean"),
+      },
+      response: {},
+    },
   },
 });