Expose GpuMemoryBufferId through glGetImageivCHROMIUM.

third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.cpp

 /*
  * Copyright (C) 2012 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 199 matching lines @@
     MailboxInfo& info = m_mailboxes.first();
     info.m_mailbox.textureTarget = GC3D_TEXTURE_RECTANGLE_ARB;
     gl->GenMailboxCHROMIUM(info.m_mailbox.name);
     gl->ProduceTextureDirectCHROMIUM(imageInfo.m_textureId, info.m_mailbox.textureTarget, info.m_mailbox.name);
     info.m_mailbox.allowOverlay = true;
 
     const GLuint64 fenceSync = gl->InsertFenceSyncCHROMIUM();
     gl->Flush();
     gl->GenSyncTokenCHROMIUM(fenceSync, info.m_mailbox.syncToken);
     info.m_mailbox.validSyncToken = true;
+    info.m_mailbox.gpuMemoryBufferId = imageInfo.m_gpuMemoryBufferId;
 
     info.m_imageInfo = imageInfo;
     *outMailbox = info.m_mailbox;
 
     gl->BindTexture(GC3D_TEXTURE_RECTANGLE_ARB, 0);
 
     // Because we are changing the texture binding without going through skia,
     // we must dirty the context.
     grContext->resetContext(kTextureBinding_GrGLBackendState);
 
@@ skipping 19 matching lines @@
     GLuint textureId;
     gl->GenTextures(1, &textureId);
     GLenum target = GC3D_TEXTURE_RECTANGLE_ARB;
     gl->BindTexture(target, textureId);
     gl->TexParameteri(target, GL_TEXTURE_MAG_FILTER, getGLFilter());
     gl->TexParameteri(target, GL_TEXTURE_MIN_FILTER, getGLFilter());
     gl->TexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
     gl->TexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
     gl->BindTexImage2DCHROMIUM(target, imageId);
 
-    return Canvas2DLayerBridge::ImageInfo(imageId, textureId);
+    GLint gpuMemoryBufferId = gl->GetImageivCHROMIUM(imageId, GC3D_GPU_MEMORY_BUFFER_ID);
+    DCHECK_NE(-1, gpuMemoryBufferId);
+
+    return Canvas2DLayerBridge::ImageInfo(imageId, textureId, gpuMemoryBufferId);
 }
 
 void Canvas2DLayerBridge::deleteCHROMIUMImage(ImageInfo info)
 {
     gpu::gles2::GLES2Interface* gl = contextGL();
     if (!gl)
         return;
 
     GLenum target = GC3D_TEXTURE_RECTANGLE_ARB;
     gl->BindTexture(target, info.m_textureId);
@@ skipping 684 matching lines @@
     getOrCreateSurface()->notifyContentWillChange(SkSurface::kRetain_ContentChangeMode);
     return adoptRef(m_surface->newImageSnapshot());
 }
 
 void Canvas2DLayerBridge::willOverwriteCanvas()
 {
     skipQueuedDrawCommands();
 }
 
 #if USE_IOSURFACE_FOR_2D_CANVAS
-Canvas2DLayerBridge::ImageInfo::ImageInfo(GLuint imageId, GLuint textureId) : m_imageId(imageId), m_textureId(textureId)
+Canvas2DLayerBridge::ImageInfo::ImageInfo(GLuint imageId, GLuint textureId, GLint gpuMemoryBufferId)
+    : m_imageId(imageId)
+    , m_textureId(textureId)
+    , m_gpuMemoryBufferId(gpuMemoryBufferId)
 {
     ASSERT(imageId);
     ASSERT(textureId);
+    DCHECK_NE(-1, gpuMemoryBufferId);
 }
 
 bool Canvas2DLayerBridge::ImageInfo::empty()
 {
     return m_imageId == 0;
 }
 #endif // USE_IOSURFACE_FOR_2D_CANVAS
 
 Canvas2DLayerBridge::MailboxInfo::MailboxInfo(const MailboxInfo& other)
 {
     memcpy(&m_mailbox, &other.m_mailbox, sizeof(m_mailbox));
     m_image = other.m_image;
     m_parentLayerBridge = other.m_parentLayerBridge;
 #if USE_IOSURFACE_FOR_2D_CANVAS
     m_imageInfo = other.m_imageInfo;
 #endif // USE_IOSURFACE_FOR_2D_CANVAS
 }
 
 void Canvas2DLayerBridge::Logger::reportHibernationEvent(HibernationEvent event)
 {
     DEFINE_STATIC_LOCAL(EnumerationHistogram, hibernationHistogram, ("Canvas.HibernationEvents", HibernationEventCount));
     hibernationHistogram.count(event);
 }
 
 } // namespace blink