Expose GLES2Interface to blink, and delete isContextLost() from WGC3D.

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/graphics/gpu/SharedContextRateLimiter.h"
 
+#include "gpu/command_buffer/client/gles2_interface.h"
 #include "platform/graphics/gpu/Extensions3DUtil.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebGraphicsContext3D.h"
 #include "public/platform/WebGraphicsContext3DProvider.h"
 
 #ifndef GL_COMMANDS_COMPLETED_CHROMIUM
 #define GL_COMMANDS_COMPLETED_CHROMIUM 0x84F7
 #endif
 
 namespace blink {
 
 PassOwnPtr<SharedContextRateLimiter> SharedContextRateLimiter::create(unsigned maxPendingTicks)
 {
     return adoptPtr(new SharedContextRateLimiter(maxPendingTicks));
 }
 
 SharedContextRateLimiter::SharedContextRateLimiter(unsigned maxPendingTicks)
     : m_maxPendingTicks(maxPendingTicks)
     , m_canUseSyncQueries(false)
 {
     m_contextProvider = adoptPtr(Platform::current()->createSharedOffscreenGraphicsContext3DProvider());
     if (!m_contextProvider)
         return;
 
-    WebGraphicsContext3D* context = m_contextProvider->context3d();
-    if (context && !context->isContextLost()) {
-        OwnPtr<Extensions3DUtil> extensionsUtil = Extensions3DUtil::create(context);
+    gpu::gles2::GLES2Interface* gl = m_contextProvider->getGLInterface();
+    if (gl && gl->GetGraphicsResetStatusKHR() == GL_NO_ERROR) {
+        OwnPtr<Extensions3DUtil> extensionsUtil = Extensions3DUtil::create(m_contextProvider->context3d(), gl);
         // TODO(junov): when the GLES 3.0 command buffer is ready, we could use fenceSync instead
         m_canUseSyncQueries = extensionsUtil->supportsExtension("GL_CHROMIUM_sync_query");
     }
 }
 
 void SharedContextRateLimiter::tick()
 {
     if (!m_contextProvider)
         return;
 
-    WebGraphicsContext3D* context = m_contextProvider->context3d();
+    gpu::gles2::GLES2Interface* gl = m_contextProvider->getGLInterface();
 
-    if (!context || context->isContextLost())
+    if (!gl || gl->GetGraphicsResetStatusKHR() != GL_NO_ERROR)
         return;
 
+    WebGraphicsContext3D* context = m_contextProvider->context3d();
     m_queries.append(m_canUseSyncQueries ? context->createQueryEXT() : 0);
     if (m_canUseSyncQueries) {
         context->beginQueryEXT(GL_COMMANDS_COMPLETED_CHROMIUM, m_queries.last());
         context->endQueryEXT(GL_COMMANDS_COMPLETED_CHROMIUM);
     }
     if (m_queries.size() > m_maxPendingTicks) {
         if (m_canUseSyncQueries) {
             WGC3Duint result;
             context->getQueryObjectuivEXT(m_queries.first(), GL_QUERY_RESULT_EXT, &result);
             context->deleteQueryEXT(m_queries.first());
             m_queries.removeFirst();
         } else {
             context->finish();
             reset();
         }
     }
 }
 
 void SharedContextRateLimiter::reset()
 {
     if (!m_contextProvider)
         return;
 
-    WebGraphicsContext3D* context = m_contextProvider->context3d();
-    if (context && !context->isContextLost()) {
+    gpu::gles2::GLES2Interface* gl = m_contextProvider->getGLInterface();
+    if (gl && gl->GetGraphicsResetStatusKHR() == GL_NO_ERROR) {
+        WebGraphicsContext3D* context = m_contextProvider->context3d();
         while (m_queries.size() > 0) {
             context->deleteQueryEXT(m_queries.first());
             m_queries.removeFirst();
         }
     } else {
         m_queries.clear();
     }
 }
 
 } // namespace blink