Fixed regression in WEBGL_draw_buffers support

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 cc48903a31bd4f0061504b323bb90972de7bdfa5..82f55a9e8de826c01a1d1b75256d58fe05b013e0 100644
--- a/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp
+++ b/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp
@@ -672,6 +672,8 @@ void DrawingBuffer::resizeDepthStencil(const IntSize& size)
         m_gl->RenderbufferStorageMultisampleCHROMIUM(GL_RENDERBUFFER, m_sampleCount, GL_DEPTH24_STENCIL8_OES, size.width(), size.height());
     else
         m_gl->RenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8_OES, size.width(), size.height());
+    // For ES 2.0 contexts DEPTH_STENCIL is not available natively, so we emulate it
+    // at the command buffer level for WebGL contexts.
     m_gl->FramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, m_depthStencilBuffer);
     m_gl->BindRenderbuffer(GL_RENDERBUFFER, 0);
 }