Merge remote-tracking branch 'origin/5.7' into 5.6

 Conflicts:
    .qmake.conf
    src/core/web_contents_view_qt.cpp

Change-Id: I7d9fbd3efcf8a3f8165244364d9528ddaf3cdbda

Author: Allan Sandfeld Jensen

LICENSE.GPL2

@@ -0,0 +1,82 @@
+Qt 5.7 introduces many new features and improvements as well as bugfixes
+over the 5.6.x series. For more details, refer to the online documentation
+included in this distribution. The documentation is also available online:
+
+  http://doc.qt.io/qt-5/index.html
+
+The Qt version 5.7 series is binary compatible with the 5.6.x series.
+Applications compiled for 5.6 will continue to run with 5.7.
+
+Some of the changes listed in this file include issue tracking numbers
+corresponding to tasks in the Qt Bug Tracker:
+
+  https://bugreports.qt.io/
+
+Each of these identifiers can be entered in the bug tracker to obtain more
+information about a particular change.
+
+****************************************************************************
+*                          General                                         *
+****************************************************************************
+
+ - Chromium Snapshot:
+   * The Chromium version has been updated to 49.0.2623.111.
+   * In addition security fixes from Chromium 50 and 51 have been merged.
+
+ - Web Features:
+   * Drag'n'drop is now supported
+   * Encrypted Media Extensions EME is now supported
+     if the PPAPI Widevine CDM plugin is installed.
+   * Spellchecking is now available if dictionaries are installed.
+
+- OS X:
+   * Added 'use_appstore_compliant_code' option to allow compiling WebEngine as Mac App Store compliant.
+
+****************************************************************************
+*                          Qt WebEngineQML                                 *
+****************************************************************************
+
+ - WebEngineView:
+   * New WebAction for saving page on disk in multiple different formats
+     including MHTML.
+   * JavaScript can now be executed in separate worlds.
+   * WebChannels can now be installed in separate worlds.
+   * Properties for recentlyAudible notification and muting of page.
+   * Content size and scroll position properties are now available.
+   * New API to print to PDF.
+
+ - WebEngineProfile:
+   * New API for disabling or clearing HTTP cache
+
+ - WebEngineSettings:
+   * New settings for controlling WebGL, automatic favicon download and more.
+
+
+****************************************************************************
+*                        Qt WebEngineWidgets                               *
+****************************************************************************
+
+ - QWebEngineContextMenuData:
+   * A new API exposing data useful for context menu generation.
+
+ - QWebEnginePage:
+   * New WebAction for opening new tabs in background.
+   * New WebAction for saving page on disk in multiple different formats
+     including MHTML.
+   * Direct access to QIcon version of favicons.
+   * JavaScript can now be executed in separate worlds.
+   * WebChannels can now be installed in separate worlds.
+   * Signals for recentlyAudible notification and muting of page.
+   * Content size and scroll position properties are now available.
+   * New API to print to PDF.
+
+ - QWebEngineProfile:
+   * New API for disabling or clearing HTTP cache
+
+ - QWebEngineSettings:
+   * New settings for controlling WebGL, automatic favicon download and more.
+
+****************************************************************************
+*                              Examples                                    *
+****************************************************************************
+