Merge 98185 - [chromium] Make setVisibility extension- and thread-correct

Source/WebCore/platform/graphics/chromium/LayerRendererChromium.cpp

Index: Source/WebCore/platform/graphics/chromium/LayerRendererChromium.cpp
===================================================================
--- Source/WebCore/platform/graphics/chromium/LayerRendererChromium.cpp	(revision 99500)
+++ Source/WebCore/platform/graphics/chromium/LayerRendererChromium.cpp	(working copy)
@@ -166,6 +166,10 @@
     if (m_capabilities.usingMapSub)
         extensions->ensureEnabled("GL_CHROMIUM_map_sub");
 
+    m_capabilities.usingSetVisibility = extensions->supports("GL_CHROMIUM_set_visibility");
+    if (m_capabilities.usingSetVisibility)
+        extensions->ensureEnabled("GL_CHROMIUM_set_visibility");
+
     GLC(m_context.get(), m_context->getIntegerv(GraphicsContext3D::MAX_TEXTURE_SIZE, &m_capabilities.maxTextureSize));
     m_capabilities.bestTextureFormat = PlatformColor::bestTextureFormat(m_context.get());
 
@@ -212,6 +216,16 @@
         LOG_ERROR("GL command failed: File: %s\n\tLine %d\n\tcommand: %s, error %x\n", file, line, command, static_cast<int>(error));
 }
 
+void LayerRendererChromium::setVisible(bool visible)
+{
+    if (!visible)
+        releaseRenderSurfaceTextures();
+    if (m_capabilities.usingSetVisibility) {
+        Extensions3DChromium* extensions3DChromium = static_cast<Extensions3DChromium*>(m_context->getExtensions());
+        extensions3DChromium->setVisibilityCHROMIUM(visible);
+    }
+}
+
 void LayerRendererChromium::releaseRenderSurfaceTextures()
 {
     m_renderSurfaceTextureManager->evictAndDeleteAllTextures(m_renderSurfaceTextureAllocator.get());