Allow html5 videos to be played inline.

ios/web/web_state/ui/wk_web_view_configuration_provider.mm

Index: ios/web/web_state/ui/wk_web_view_configuration_provider.mm
diff --git a/ios/web/web_state/ui/wk_web_view_configuration_provider.mm b/ios/web/web_state/ui/wk_web_view_configuration_provider.mm
index c3f6db2d30c689530be997ce0c0cd9d8a5698c96..5016065c7594f2ee5b8d4eb16a5cd2018d4e4014 100644
--- a/ios/web/web_state/ui/wk_web_view_configuration_provider.mm
+++ b/ios/web/web_state/ui/wk_web_view_configuration_provider.mm
@@ -71,6 +71,9 @@ WKWebViewConfigurationProvider::GetWebViewConfiguration() {
                                            WKDataDetectorTypePhoneNumber];
     }
 #endif
+    if (base::ios::IsRunningOnIOS10OrLater()) {
+      [configuration_ setAllowsInlineMediaPlayback:YES];

[Eugene But (OOO till 7-30), 2016/08/19 21:32:11]

If this does not break anything on iOS9 we should enable inline playback
unconditionally (even if it's no-op on iOS9)

+    }
     // setJavaScriptCanOpenWindowsAutomatically is required to support popups.
     [[configuration_ preferences] setJavaScriptCanOpenWindowsAutomatically:YES];
     [[configuration_ userContentController]