Making use of bindless variants mailbox produce/consume.

Source/platform/graphics/gpu/DrawingBuffer.cpp

Index: Source/platform/graphics/gpu/DrawingBuffer.cpp
diff --git a/Source/platform/graphics/gpu/DrawingBuffer.cpp b/Source/platform/graphics/gpu/DrawingBuffer.cpp
index 9518743130513b988089fc949a74ad621053483f..0ec4bf9179012c1217b92aa3362f4f7d02e1e9df 100644
--- a/Source/platform/graphics/gpu/DrawingBuffer.cpp
+++ b/Source/platform/graphics/gpu/DrawingBuffer.cpp
@@ -455,8 +455,7 @@ bool DrawingBuffer::copyToPlatformTexture(blink::WebGraphicsContext3D* context,
     // Contexts may be in a different share group. We must transfer the texture through a mailbox first
     RefPtr<MailboxInfo> bufferMailbox = adoptRef(new MailboxInfo());
     m_context->genMailboxCHROMIUM(bufferMailbox->mailbox.name);
-    m_context->bindTexture(GL_TEXTURE_2D, textureId);
-    m_context->produceTextureCHROMIUM(GL_TEXTURE_2D, bufferMailbox->mailbox.name);
+    m_context->produceTextureDirectCHROMIUM(textureId, GL_TEXTURE_2D, bufferMailbox->mailbox.name);
     m_context->flush();
 
     bufferMailbox->mailbox.syncPoint = m_context->insertSyncPoint();
@@ -464,16 +463,8 @@ bool DrawingBuffer::copyToPlatformTexture(blink::WebGraphicsContext3D* context,
     if (!context->makeContextCurrent())
         return false;
 
-    Platform3DObject sourceTexture = context->createTexture();
-
-    // TODO(bajones): Should be able to change the texture bindings here without reverting but
-    // something else in the system is depending on it. Failing to revert causes WebGL
-    // tests to fail. We should find out why and fix it.
-    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);
+    Platform3DObject sourceTexture = context->createAndConsumeTextureCHROMIUM(GL_TEXTURE_2D, bufferMailbox->mailbox.name);
 
     bool unpackPremultiplyAlphaNeeded = false;
     bool unpackUnpremultiplyAlphaNeeded = false;
@@ -490,7 +481,6 @@ bool DrawingBuffer::copyToPlatformTexture(blink::WebGraphicsContext3D* context,
     context->pixelStorei(GC3D_UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM, false);
     context->pixelStorei(GC3D_UNPACK_PREMULTIPLY_ALPHA_CHROMIUM, false);
 
-    context->bindTexture(GL_TEXTURE_2D, boundTexture);
     context->deleteTexture(sourceTexture);
 
     context->flush();