webgl: Zero-initialize the SyncToken before calling GenSyncTokenCHROMIUM

third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp

Index: third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp b/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp
index 4b8eeaf947af65d0af16af89bf08a1be0ddc4cd5..729b76da43a45b2af500c6b78ece60359dd13f5f 100644
--- a/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp
+++ b/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp
@@ -569,7 +569,7 @@ bool DrawingBuffer::copyToPlatformTexture(gpu::gles2::GLES2Interface* gl, GLuint
     const GLuint64 fenceSync = gl->InsertFenceSyncCHROMIUM();
 
     gl->Flush();
-    GLbyte syncToken[24];
+    GLbyte syncToken[24] = { 0 };

[Ken Russell (switch to Gerrit), 2016/07/18 21:27:05]

Is this code allowed to reference src/gpu/GLES2/gl2extchromium.h at this point?
It would be preferable to change the "24" to GL_SYNC_TOKEN_SIZE_CHROMIUM.

[danakj, 2016/07/18 21:40:35]

Done. Thanks, didn't know that exists.

     gl->GenSyncTokenCHROMIUM(fenceSync, syncToken);
     m_gl->WaitSyncTokenCHROMIUM(syncToken);