Reland "webgl: use immutable texture for the default FBO."

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

 /*
  * Copyright (C) 2013 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 212 matching lines @@
         RefPtr<DrawingBufferForTests> drawingBuffer = adoptRef(new DrawingBufferForTests(std::move(contextProvider), std::move(extensionsUtil), preserve));
         bool multisampleExtensionSupported = false;
         if (!drawingBuffer->initialize(size, multisampleExtensionSupported)) {
             drawingBuffer->beginDestruction();
             return nullptr;
         }
         return drawingBuffer.release();
     }
 
     DrawingBufferForTests(std::unique_ptr<WebGraphicsContext3DProvider> contextProvider, std::unique_ptr<Extensions3DUtil> extensionsUtil, PreserveDrawingBuffer preserve)
-        : DrawingBuffer(std::move(contextProvider), std::move(extensionsUtil), false /* discardFramebufferSupported */, true /* wantAlphaChannel */, false /* premultipliedAlpha */, preserve, false /* wantDepth */, false /* wantStencil */)
+        : DrawingBuffer(std::move(contextProvider), std::move(extensionsUtil), false /* discardFramebufferSupported */,
+            true /* wantAlphaChannel */, false /* premultipliedAlpha */, preserve, WebGL1,
+            false /* wantDepth */, false /* wantStencil */)
         , m_live(0)
     { }
 
     ~DrawingBufferForTests() override
     {
         if (m_live)
             *m_live = false;
     }
 
     bool* m_live;
@@ skipping 476 matching lines @@
         bool wantStencilBuffer = cases[i].requestStencil;
         bool wantAntialiasing = false;
         RefPtr<DrawingBuffer> drawingBuffer = DrawingBuffer::create(
             std::move(provider),
             IntSize(10, 10),
             premultipliedAlpha,
             wantAlphaChannel,
             wantDepthBuffer,
             wantStencilBuffer,
             wantAntialiasing,
-            preserve);
+            preserve,
+            DrawingBuffer::WebGL1);
 
         // When we request a depth or a stencil buffer, we will get both.
         EXPECT_EQ(cases[i].requestDepth || cases[i].requestStencil, drawingBuffer->hasDepthBuffer());
         EXPECT_EQ(cases[i].requestDepth || cases[i].requestStencil, drawingBuffer->hasStencilBuffer());
         EXPECT_EQ(cases[i].expectedRenderBuffers, trackingGL->numAllocatedRenderBuffer());
         if (cases[i].requestDepth || cases[i].requestStencil) {
             EXPECT_NE(0u, trackingGL->depthStencilAttachment());
             EXPECT_EQ(0u, trackingGL->depthAttachment());
             EXPECT_EQ(0u, trackingGL->stencilAttachment());
         } else {
@@ skipping 35 matching lines @@
     // m_drawingBuffer deletes mailbox immediately when hidden.
 
     GLuint waitSyncToken = 0;
     memcpy(&waitSyncToken, mailbox.syncToken, sizeof(waitSyncToken));
     EXPECT_EQ(waitSyncToken, m_gl->mostRecentlyWaitedSyncToken());
 
     m_drawingBuffer->beginDestruction();
 }
 
 } // namespace blink