Allow html5 videos to be played inline.

ios/web/web_state/ui/wk_web_view_configuration_provider.mm

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/web/web_state/ui/wk_web_view_configuration_provider.h"
 
 #import <Foundation/Foundation.h>
 #import <WebKit/WebKit.h>
 
 #include "base/ios/ios_util.h"
@@ skipping 53 matching lines @@
           setWebsiteDataStore:[WKWebsiteDataStore nonPersistentDataStore]];
     }
 // TODO(crbug.com/620878) Remove these guards after moving to iOS10 SDK.
 #if defined(__IPHONE_10_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_10_0
     if (base::ios::IsRunningOnIOS10OrLater()) {
       [configuration_ setDataDetectorTypes:WKDataDetectorTypeCalendarEvent |
                                            WKDataDetectorTypeFlightNumber |
                                            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]
         addUserScript:InternalGetEarlyPageScript()];
   }
   // Prevent callers from changing the internals of configuration.
   return [[configuration_ copy] autorelease];
 }
 
 CRWWKScriptMessageRouter*
@@ skipping 18 matching lines @@
   configuration_.reset();
   router_.reset();
   // Make sure that no one retains configuration, router, processPool.
   DCHECK(!weak_configuration);
   DCHECK(!weak_router);
   // TODO(crbug.com/522672): Enable this DCHECK.
   // DCHECK(!weak_process_pool);
 }
 
 }  // namespace web