Add qtwebengine as submodule

qtwebkit is listed as an optional dependency for
qtwebengine to ensure that qtwebkit and qtwebengine
are not linked in parallel on the CI system.
Otherwise we could run out of memory.

Change-Id: Ib80d72407df03037c928d99f55c8e04e98e506d9
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>

.gitmodules

@@ -106,3 +106,6 @@
 [submodule "qtwebchannel"]
 	path = qtwebchannel
 	url = ../qtwebchannel.git
+[submodule "qtwebengine"]
+	path = qtwebengine
+	url = ../qtwebengine.git

init-repository

@@ -235,6 +235,7 @@ my %GERRIT_REPOS = map { $_ => "qt/$_" } qw(
     qttranslations
     qtwayland
     qtwebchannel
+    qtwebengine
     qtwebkit
     qtwebkit-examples
     qtwebsockets
@@ -268,6 +269,7 @@ my @DEFAULT_REPOS = qw(
     qttranslations
     qtwayland
     qtwebchannel
+    qtwebengine
     qtwebsockets
     qtwebkit
     qtwebkit-examples

qt.pro

@@ -89,6 +89,7 @@ addModule(qtdocgallery, qtdeclarative, qtjsondb)
 linux:!android: addModule(qtwayland, qtbase, qtdeclarative)
 addModule(qtserialport, qtbase)
 addModule(qtenginio, qtdeclarative)
+addModule(qtwebengine, qtquickcontrols, qtwebkit)
 addModule(qttranslations, qttools)
 addModule(qtdoc, qtdeclarative)
 addModule(qtqa, qtbase)