Bug 832700 - Add private browsing to b2g, API implementation r=ehsan,smaug

content/base/src/nsGkAtomList.h

@@ -609,6 +609,7 @@ GK_ATOM(mozfullscreenerror, "mozfullscreenerror")
 GK_ATOM(mozpasspointerevents, "mozpasspointerevents")
 GK_ATOM(mozpointerlockchange, "mozpointerlockchange")
 GK_ATOM(mozpointerlockerror, "mozpointerlockerror")
+GK_ATOM(mozprivatebrowsing, "mozprivatebrowsing")
 GK_ATOM(moz_opaque, "moz-opaque")
 GK_ATOM(moz_action_hint, "mozactionhint")
 GK_ATOM(x_moz_errormessage, "x-moz-errormessage")

docshell/base/nsDocShell.cpp

@@ -851,6 +851,7 @@ nsDocShell::nsDocShell():
 #endif
     mAffectPrivateSessionLifetime(true),
     mInvisible(false),
+    mHasLoadedNonBlankURI(false),
     mDefaultLoadFlags(nsIRequest::LOAD_NORMAL),
     mFrameType(eFrameTypeRegular),
     mOwnOrContainingAppId(nsIScriptSecurityManager::UNKNOWN_APP_ID),
@@ -1928,6 +1929,10 @@ nsDocShell::SetCurrentURI(nsIURI *aURI, nsIRequest *aRequest,
 
     mCurrentURI = NS_TryToMakeImmutable(aURI);
     
+    if (!NS_IsAboutBlank(mCurrentURI)) {
+      mHasLoadedNonBlankURI = true;
+    }
+
     bool isRoot = false;   // Is this the root docshell
     bool isSubFrame = false;  // Is this a subframe navigation?
 
@@ -2277,6 +2282,15 @@ nsDocShell::SetPrivateBrowsing(bool aUsePrivateBrowsing)
     return NS_OK;
 }
 
+NS_IMETHODIMP
+nsDocShell::GetHasLoadedNonBlankURI(bool* aResult)
+{
+    NS_ENSURE_ARG_POINTER(aResult);
+
+    *aResult = mHasLoadedNonBlankURI;
+    return NS_OK;
+}
+
 NS_IMETHODIMP
 nsDocShell::GetUseRemoteTabs(bool* aUseRemoteTabs)
 {

docshell/base/nsDocShell.h

@@ -915,6 +915,7 @@ protected:
 #endif
     bool                       mAffectPrivateSessionLifetime;
     bool                       mInvisible;
+    bool                       mHasLoadedNonBlankURI;
     uint64_t                   mHistoryID;
     uint32_t                   mDefaultLoadFlags;
 

docshell/base/nsIDocShell.idl

@@ -54,7 +54,7 @@ interface nsITabParent;
  
 typedef unsigned long nsLoadFlags;
 
-[scriptable, builtinclass, uuid(2b8e4a50-7744-454d-a05b-debead8070fe)]
+[scriptable, builtinclass, uuid(23157a63-26fd-44a0-a0f9-fdc64dcc004c)]
 interface nsIDocShell : nsIDocShellTreeItem
 {
   /**
@@ -1017,4 +1017,11 @@ interface nsIDocShell : nsIDocShellTreeItem
 
   // URLSearchParams for the window.location is owned by the docShell.
   [noscript,notxpcom] URLSearchParams getURLSearchParams();
+
+  /**
+   * This attribute determines whether a document which is not about:blank has
+   * already be loaded by this docShell.
+   */
+  [infallible] readonly attribute boolean hasLoadedNonBlankURI;
+
 };

dom/browser-element/BrowserElementChild.js

@@ -56,3 +56,10 @@ let infos = sendSyncMessage('browser-element-api:call',
                             { 'msg_name': 'hello' })[0];
 docShell.QueryInterface(Ci.nsIDocShellTreeItem).name = infos.name;
 docShell.setFullscreenAllowed(infos.fullscreenAllowed);
+if (infos.isPrivate) {
+  if (docShell.hasLoadedNonBlankURI) {
+    Cu.reportError("We should not switch to Private Browsing after loading a document.");
+  } else {
+    docShell.QueryInterface(Ci.nsILoadContext).usePrivateBrowsing = true;
+  }
+}

dom/browser-element/BrowserElementParent.cpp

@@ -76,6 +76,14 @@ CreateIframe(Element* aOpenerFrameElement, const nsAString& aName, bool aRemote)
                                        NS_LITERAL_STRING("false"),
                              /* aNotify = */ false);
 
+  // Copy the opener frame's mozprivatebrowsing attribute to the popup frame.
+  nsAutoString mozprivatebrowsing;
+  if (aOpenerFrameElement->GetAttr(kNameSpaceID_None, nsGkAtoms::mozprivatebrowsing,
+                                   mozprivatebrowsing)) {
+    popupFrameElement->SetAttr(kNameSpaceID_None, nsGkAtoms::mozprivatebrowsing,
+                               mozprivatebrowsing, /* aNotify = */ false);
+  }
+
   return popupFrameElement.forget();
 }
 

dom/browser-element/BrowserElementParent.jsm

@@ -389,7 +389,8 @@ BrowserElementParent.prototype = {
       name: this._frameElement.getAttribute('name'),
       fullscreenAllowed:
         this._frameElement.hasAttribute('allowfullscreen') ||
-        this._frameElement.hasAttribute('mozallowfullscreen')
+        this._frameElement.hasAttribute('mozallowfullscreen'),
+      isPrivate: this._frameElement.hasAttribute('mozprivatebrowsing')
     };
   },