Fix the remaining issue of seperating WebGL from the default share group

Source/platform/graphics/gpu/DrawingBuffer.cpp

 /*
  * Copyright (c) 2010, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 23 matching lines @@
 
 #include <algorithm>
 #include "platform/TraceEvent.h"
 #include "platform/graphics/GraphicsLayer.h"
 #include "platform/graphics/gpu/Extensions3DUtil.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebCompositorSupport.h"
 #include "public/platform/WebExternalBitmap.h"
 #include "public/platform/WebExternalTextureLayer.h"
 #include "public/platform/WebGraphicsContext3D.h"
+#include "public/platform/WebGraphicsContext3DProvider.h"
 
 using namespace std;
 
 namespace WebCore {
 
 // Global resource ceiling (expressed in terms of pixels) for DrawingBuffer creation and resize.
 // When this limit is set, DrawingBuffer::create() and DrawingBuffer::reset() calls that would
 // exceed the global cap will instead clear the buffer.
 static const int s_maximumResourceUsePixels = 16 * 1024 * 1024;
 static int s_currentResourceUsePixels = 0;
@@ skipping 350 matching lines @@
 
 void DrawingBuffer::paintCompositedResultsToCanvas(ImageBuffer* imageBuffer)
 {
     if (!m_context || !m_context->makeContextCurrent() || m_context->getGraphicsResetStatusARB() != GL_NO_ERROR)
         return;
 
     if (!imageBuffer)
         return;
     Platform3DObject tex = imageBuffer->getBackingTexture();
     if (tex) {
-        m_context->copyTextureCHROMIUM(GL_TEXTURE_2D, m_frontColorBuffer,
+        RefPtr<MailboxInfo> bufferMailbox = adoptRef(new MailboxInfo());
+        m_context->genMailboxCHROMIUM(bufferMailbox->mailbox.name);
+        m_context->bindTexture(GL_TEXTURE_2D, m_frontColorBuffer);
+        m_context->produceTextureCHROMIUM(GL_TEXTURE_2D, bufferMailbox->mailbox.name);
+        m_context->flush();
+
+        bufferMailbox->mailbox.syncPoint = m_context->insertSyncPoint();
+        OwnPtr<blink::WebGraphicsContext3DProvider> provider =
+            adoptPtr(blink::Platform::current()->createSharedOffscreenGraphicsContext3DProvider());
+        if (!provider)
+            return;
+        blink::WebGraphicsContext3D* context = provider->context3d();
+        if (!context || !context->makeContextCurrent())
+            return;
+
+        Platform3DObject sourceTexture = context->createTexture();
+        GLint boundTexture = 0;
+        context->getIntegerv(GL_TEXTURE_BINDING_2D, &boundTexture);
+        context->bindTexture(GL_TEXTURE_2D, sourceTexture);
+        context->waitSyncPoint(bufferMailbox->mailbox.syncPoint);
+        context->consumeTextureCHROMIUM(GL_TEXTURE_2D, bufferMailbox->mailbox.name);
+        context->copyTextureCHROMIUM(GL_TEXTURE_2D, sourceTexture,
             tex, 0, GL_RGBA, GL_UNSIGNED_BYTE);
-        m_context->flush();
+        context->bindTexture(GL_TEXTURE_2D, boundTexture);
+        context->deleteTexture(sourceTexture);
+        context->flush();
+        m_context->waitSyncPoint(context->insertSyncPoint());
         return;
     }
 
     // Since the m_frontColorBuffer was produced and sent to the compositor, it cannot be bound to an fbo.
     // We have to make a copy of it here and bind that copy instead.
     // FIXME: That's not true any more, provided we don't change texture
     // parameters.
     unsigned sourceTexture = createColorTexture(m_size);
     m_context->copyTextureCHROMIUM(GL_TEXTURE_2D, m_frontColorBuffer, sourceTexture, 0, GL_RGBA, GL_UNSIGNED_BYTE);
 
@@ skipping 494 matching lines @@
     }
 }
 
 void DrawingBuffer::texImage2DResourceSafe(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, GLint unpackAlignment)
 {
     ASSERT(unpackAlignment == 1 || unpackAlignment == 2 || unpackAlignment == 4 || unpackAlignment == 8);
     m_context->texImage2D(target, level, internalformat, width, height, border, format, type, 0);
 }
 
 } // namespace WebCore