browser(firefox): implement Page.bringToFront (#3051)

browser_patches/firefox/BUILD_NUMBER

@@ -1,2 +1,2 @@
-1133
+1134
-Changed: yurys@chromium.org Mon Jul 20 14:11:12 PDT 2020
+Changed: pavel.feldman@gmail.com Mon Jul 20 15:11:16 PDT 2020

browser_patches/firefox/juggler/protocol/PageHandler.js

@@ -179,6 +179,10 @@ class PageHandler {
     return await this._contentPage.send('setEmulatedMedia', options);
   }
 
+  async bringToFront(options) {
+    this._pageTarget._window.focus();
+  }
+
   async setCacheDisabled(options) {
     return await this._contentPage.send('setCacheDisabled', options);
   }

browser_patches/firefox/juggler/protocol/Protocol.js

@@ -654,6 +654,10 @@ const Page = {
         viewportSize: t.Nullable(pageTypes.Size),
       },
     },
+    'bringToFront': {
+      params: {
+      },
+    },
     'setEmulatedMedia': {
       params: {
         type: t.Optional(t.Enum(['screen', 'print', ''])),

browser_patches/firefox/patches/bootstrap.diff

@@ -651,6 +651,21 @@ index e268e2bbe8add1b43f6e4d6507cc7810d707a344..a34a7a292a02ea8d94042475a43ae3a0
  
    dom::MediaCapabilities* MediaCapabilities();
    dom::MediaSession* MediaSession();
+diff --git a/dom/base/nsFocusManager.cpp b/dom/base/nsFocusManager.cpp
+index 7fd3b0069dfd8159818c0f80d0c1cee901ce074a..77f08fb399145302677d36003884e9d775cc4e44 100644
+--- a/dom/base/nsFocusManager.cpp
++++ b/dom/base/nsFocusManager.cpp
+@@ -2649,7 +2649,9 @@ void nsFocusManager::RaiseWindow(nsPIDOMWindowOuter* aWindow,
+     }
+   }
+ 
+-  if (sTestMode) {
++  // In Playwright, we still want to execte the embedder functions
++  // to actually show / focus windows.
++  if (false && sTestMode) {
+     // In test mode, emulate raising the window. WindowRaised takes
+     // care of lowering the present active window. This happens in
+     // a separate runnable to avoid touching multiple windows in
 diff --git a/dom/base/nsGlobalWindowOuter.cpp b/dom/base/nsGlobalWindowOuter.cpp
 index da9d56e843a2c762dc7d5527712cdd3d30418f7f..aa3d2d6022b60ac3a263c2d1df4eb12714d8e728 100644
 --- a/dom/base/nsGlobalWindowOuter.cpp