[misc][XWALK-2231] Integrate MediaSource API Demo

- https://github.com/ebidel/html5demos/blob/master/html5-demos.appspot.com/static/media-source.html
  under the Apache License, Version 2.0
- Bug  https://crosswalk-project.org/jira/browse/XWALK-2231
- Task https://crosswalk-project.org/jira/browse/XWALK-2331
[misc] Comment out google fonts and analytics dependency
[webapi] Update 3 TCs for iap

- Update 3 TCs for iap
- Failure analysis: "In App Purchase" feature is not allowed in China

Impacted tests(approved): new 0, update 3, delete 0
Unit test platform: [Android]
Unit test result summary: pass 0, fail 3, block 0
[sample] Remove XML styles

- These style files are not must for the samples, and
  they are from testkit-lite repo under GPL 2.0 License
[sample] Remove trailing space from suite.json
Merge pull request #817 from zqzhang/remove-xsl

[sample] Remove XML styles
[sample] Rename webapi-sample-tests to DemoExpress and sort case names

 Unit test platform: Android
 Unit test result: all tests run well
Merge pull request #819 from Honry/Honry/rename-sample

[sample] Rename webapi-sample-tests to DemoExpress and sort case names
Replace blue.png with blue-100x100.png
Format .html of DnD sample
[sample] Rename thirdparty/ to jquery/
[sample] Remove language="javascript" and type="text/javascript"
Merge pull request #820 from zqzhang/thirdparty-jquery

[sample] Rename thirdparty/ to jquery/
Merge pull request #821 from zqzhang/zqzhang/XWALK-2231

[misc][XWALK-2231] Integrate MediaSource API Demo
[misc] Remove XML styles

- These style files are not must for the samples, and
  they are from testkit-lite repo under GPL 2.0 License
- At current being the test result cannot be saved
  after existing the tests. This is buggy.
[misc] Remove trailing space from suite.json
Merge pull request #823 from zqzhang/xml-style-remove

[misc] Remove XML styles
[usecase-webapi] Fix style issue and add icon in Viewport

 Impacted TCs num: New 0, Update 4, Delete: 0
 Unit test platform: Android
 Unit test result: Pass 4, Fail 0, Block 0
[sample] Remove unreferenced CanvasTest.ttf
Merge pull request #825 from zqzhang/CanvasTest.ttf

[sample] Remove unreferenced CanvasTest.ttf