gpu: Associate all GpuMemoryBuffers with unique IDs.

content/common/gpu/client/gpu_memory_buffer_impl.cc

Index: content/common/gpu/client/gpu_memory_buffer_impl.cc
diff --git a/content/common/gpu/client/gpu_memory_buffer_impl.cc b/content/common/gpu/client/gpu_memory_buffer_impl.cc
index b761d1dcec2330dd4b6529bf0d033361abd7076c..65edde33f1259e49fb1c0fde177646b3f2d3ddff 100644
--- a/content/common/gpu/client/gpu_memory_buffer_impl.cc
+++ b/content/common/gpu/client/gpu_memory_buffer_impl.cc
@@ -8,10 +8,12 @@
 
 namespace content {
 
-GpuMemoryBufferImpl::GpuMemoryBufferImpl(const gfx::Size& size,
+GpuMemoryBufferImpl::GpuMemoryBufferImpl(gfx::GpuMemoryBufferId id,
+                                         const gfx::Size& size,
                                          Format format,
                                          const DestructionCallback& callback)
-    : size_(size),
+    : id_(id),
+      size_(size),
       format_(format),
       callback_(callback),
       mapped_(false),