Making use of bindless variants mailbox produce/consume.

Source/platform/graphics/ImageBuffer.cpp

Index: Source/platform/graphics/ImageBuffer.cpp
diff --git a/Source/platform/graphics/ImageBuffer.cpp b/Source/platform/graphics/ImageBuffer.cpp
index 55c1b939b09bcde9a0e5ca85741b29f009c6b58a..c4439d2c953019e049a3bf2b34743a6e6c7f5068 100644
--- a/Source/platform/graphics/ImageBuffer.cpp
+++ b/Source/platform/graphics/ImageBuffer.cpp
@@ -170,8 +170,7 @@ bool ImageBuffer::copyToPlatformTexture(blink::WebGraphicsContext3D* context, Pl
 
     // Contexts may be in a different share group. We must transfer the texture through a mailbox first
     sharedContext->genMailboxCHROMIUM(mailbox->name);
-    sharedContext->bindTexture(GL_TEXTURE_2D, getBackingTexture());
-    sharedContext->produceTextureCHROMIUM(GL_TEXTURE_2D, mailbox->name);
+    sharedContext->produceTextureDirectCHROMIUM(getBackingTexture(), GL_TEXTURE_2D, mailbox->name);
     sharedContext->flush();
 
     mailbox->syncPoint = sharedContext->insertSyncPoint();
@@ -179,12 +178,8 @@ bool ImageBuffer::copyToPlatformTexture(blink::WebGraphicsContext3D* context, Pl
     if (!context->makeContextCurrent())
         return false;
 
-    Platform3DObject sourceTexture = context->createTexture();
-
-    context->bindTexture(GL_TEXTURE_2D, sourceTexture);
-
     context->waitSyncPoint(mailbox->syncPoint);
-    context->consumeTextureCHROMIUM(GL_TEXTURE_2D, mailbox->name);
+    Platform3DObject sourceTexture = context->createAndConsumeTextureCHROMIUM(GL_TEXTURE_2D, mailbox->name);
 
     // The canvas is stored in a premultiplied format, so unpremultiply if necessary.
     context->pixelStorei(GC3D_UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM, !premultiplyAlpha);
@@ -196,7 +191,6 @@ bool ImageBuffer::copyToPlatformTexture(blink::WebGraphicsContext3D* context, Pl
     context->pixelStorei(GC3D_UNPACK_FLIP_Y_CHROMIUM, false);
     context->pixelStorei(GC3D_UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM, false);
 
-    context->bindTexture(GL_TEXTURE_2D, 0);
     context->deleteTexture(sourceTexture);
 
     context->flush();