Re-land: 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

Review URL: https://codereview.chromium.org/238933003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@264675 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 62 insertions, 0 deletions

diff --git a/gpu/GLES2/extensions/CHROMIUM/CHROMIUM_sync_query.txt b/gpu/GLES2/extensions/CHROMIUM/CHROMIUM_sync_query.txt
new file mode 100644
index 0000000..98763d0
--- /dev/null
+++ b/gpu/GLES2/extensions/CHROMIUM/CHROMIUM_sync_query.txt
@@ -0,0 +1,53 @@
+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 db4f12f..0bdf717 100644
--- a/gpu/GLES2/gl2extchromium.h
+++ b/gpu/GLES2/gl2extchromium.h
@@ -692,6 +692,15 @@ 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