Revert of gpu: Add CHROMIUM_sync_query extension. (https://codereview.chromium.org/238933003/)

Reason for revert:
[gardening]

Seems that QueryTest.SyncQueryBasic started to fail on Android Tests (dbug).

http://build.chromium.org/p/chromium.webkit/builders/Android%20Tests%20%28dbg%29
http://build.chromium.org/p/chromium.webkit/builders/Android%20Tests%20%28dbg%29/builds/18673/steps/gl_tests/logs/stdio

[==========] Running 1 test from 1 test case.
[----------] Global test environment set-up.
[----------] 1 test from QueryTest
[ RUN      ] QueryTest.SyncQueryBasic
../../gpu/command_buffer/tests/gl_query_unittest.cc:154: Failure
Value of: GLTestHelper::HasExtension("GL_CHROMIUM_sync_query")
  Actual: false
Expected: true
[0417/014324:ERROR:gles2_cmd_decoder.cc(9542)] [GroupMarkerNotSet(crbug.com/242999)!:04B0A600]GL ERROR :GL_INVALID_OPERATION : glBeginQueryEXT: not enabled for commands completed queries
[0417/014324:ERROR:gles2_cmd_decoder.cc(9617)] [GroupMarkerNotSet(crbug.com/242999)!:04B0A600]GL ERROR :GL_INVALID_OPERATION : glEndQueryEXT: No active query
../../gpu/command_buffer/tests/gl_query_unittest.cc:166: Failure
Value of: available
  Actual: false
Expected: true
../../gpu/command_buffer/tests/gl_manager.cc:241: Failure
Value of: glGetError() == GL_NONE
  Actual: false
Expected: true
[  FAILED  ] QueryTest.SyncQueryBasic (70 ms)
[----------] 1 test from QueryTest (71 ms total)

[----------] Global test environment tear-down
[==========] 1 test from 1 test case ran. (71 ms total)
[  PASSED  ] 0 tests.
[  FAILED  ] 1 test, listed below:
[  FAILED  ] QueryTest.SyncQueryBasic



In range 264168:264191, this patch might be the culprit.

Let me revert this patch and watch whether Android Tests will cycle to green or not.


Original issue's description:
> gpu: Add CHROMIUM_sync_query extension.
> 
> This adds a GL_COMMANDS_COMPLETED_CHROMIUM query target that provide
> a finer granularity of synchronizing GL command completion than offered
> by glFinish().
> 
> BUG=269808,356871,273274
> TEST=gpu_unittests --gtest_filter=GLES2DecoderManualInitTest.BeginEndQueryEXTCommandsCompletedCHROMIUM
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=264173

TBR=piman@chromium.org,epenner@chromium.org,sievers@chromium.org,reveman@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=269808,356871,273274

Review URL: https://codereview.chromium.org/240273006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@264407 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 0 insertions, 62 deletions

diff --git a/gpu/GLES2/extensions/CHROMIUM/CHROMIUM_sync_query.txt b/gpu/GLES2/extensions/CHROMIUM/CHROMIUM_sync_query.txt
deleted file mode 100644
index 98763d0..0000000
--- a/gpu/GLES2/extensions/CHROMIUM/CHROMIUM_sync_query.txt
+++ /dev/null
@@ -1,53 +0,0 @@
-Name
-
-    CHROMIUM_sync_query
-
-Name Strings
-
-    GL_CHROMIUM_sync_query
-
-Version
-
-    Last Modifed Date: April 15, 2014
-
-Dependencies
-
-    OpenGL ES 2.0 is required.
-
-    EXT_occlusion_query_boolean is required.
-
-Overview
-
-    This extension provides a query mechanism that allow for synchronization
-    between the host CPU and the GPU, which may be accessing the same
-    resources (typically memory).
-
-    This extension is useful in conjunction with CHROMIUM_map_image to
-    determine when it is safe to access a mapped image. Once the result of
-    a COMMANDS_COMPLETED_CHROMIUM query is available, all drawing commands
-    issued before the query must have finished. This ensures that the memory
-    corresponding to the issued commands can be safely modified (assuming no
-    other outstanding drawing commands are issued subsequent to the query).
-
-New Procedures and Functions
-
-    None.
-
-Errors
-
-    None.
-
-New Tokens
-
-    Accepted by the <target> parameter of BeginQueryEXT, EndQueryEXT,
-    and GetQueryivEXT:
-
-        COMMANDS_COMPLETED_CHROMIUM                     0x84F7
-
-New State
-
-    None.
-
-Revision History
-
-    4/15/2014   Documented the extension
diff --git a/gpu/GLES2/gl2extchromium.h b/gpu/GLES2/gl2extchromium.h
index 0bdf717..db4f12f 100644
--- a/gpu/GLES2/gl2extchromium.h
+++ b/gpu/GLES2/gl2extchromium.h
@@ -692,15 +692,6 @@ typedef void(GL_APIENTRYP PFNGLSCHEDULEOVERLAYPLANECHROMIUMPROC)(
     GLfloat uv_height);
 #endif /* GL_CHROMIUM_schedule_overlay_plane */
 
-/* GL_CHROMIUM_sync_query */
-#ifndef GL_CHROMIUM_sync_query
-#define GL_CHROMIUM_sync_query 1
-
-#ifndef GL_COMMANDS_COMPLETED_CHROMIUM
-#define GL_COMMANDS_COMPLETED_CHROMIUM 0x84F7
-#endif
-#endif  /* GL_CHROMIUM_sync_query */
-
 #ifdef __cplusplus
 }
 #endif