Revert of Delete video_render module. (patchset #12 id:220001 of https://codereview.webrtc.org/1912143002/ )

Reason for revert:
This breaks every buildbot in chromium.webrtc.fyi and I don't see any roll in progress to address this (and I don't see how that would be possible either).
Usage in Chrome: https://code.google.com/p/chromium/codesearch#search/&q=modules.gyp%3Avideo_render&sq=package:chromium&type=cs

Example failures:
https://build.chromium.org/p/chromium.webrtc.fyi/builders/Linux%20Builder/builds/5420
https://build.chromium.org/p/chromium.webrtc.fyi/builders/Win%20Builder/builds/4526

I think it's fine to delete our video_render_module_internal_impl target and those files, but video_render target needs to remain.

Original issue's description:
> Delete video_render module.
>
> BUG=webrtc:5817
>
> Committed: https://crrev.com/97cfd1ec05d07ef233356e57f7aa4b028b74ffba
> Cr-Commit-Position: refs/heads/master@{#12526}

TBR=mflodman@webrtc.org,pbos@webrtc.org,nisse@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:5817

Review-Url: https://codereview.webrtc.org/1923613003
Cr-Commit-Position: refs/heads/master@{#12534}
diff --git a/webrtc/modules/modules.gyp b/webrtc/modules/modules.gyp
index de47272..502454c 100644
--- a/webrtc/modules/modules.gyp
+++ b/webrtc/modules/modules.gyp
@@ -26,6 +26,7 @@
     'video_coding/video_coding.gypi',
     'video_capture/video_capture.gypi',
     'video_processing/video_processing.gypi',
+    'video_render/video_render.gypi',
   ],
   'conditions': [
     ['include_tests==1', {
@@ -780,6 +781,19 @@
                 'modules_unittests.isolate',
               ],
             },
+            {
+              'target_name': 'video_render_tests_run',
+              'type': 'none',
+              'dependencies': [
+                'video_render_tests',
+              ],
+              'includes': [
+                '../build/isolate.gypi',
+              ],
+              'sources': [
+                'video_render_tests.isolate',
+              ],
+            },
           ],
         }],
       ],