Add debugging info for software compositor swap.

content/browser/renderer_host/render_widget_host_view_aura.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_aura.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
@@ skipping 1567 matching lines @@
   const size_t size_in_bytes = 4 * frame_size.GetArea();
 #ifdef OS_WIN
   scoped_ptr<base::SharedMemory> shared_memory(
       new base::SharedMemory(frame_data->handle, true,
                              host_->GetProcess()->GetHandle()));
 #else
   scoped_ptr<base::SharedMemory> shared_memory(
       new base::SharedMemory(frame_data->handle, true));
 #endif
 
-  if (!shared_memory->Map(size_in_bytes)) {
+#ifdef OS_WIN
+  if (!shared_memory->Map(0)) {
+    DLOG(ERROR) << "Unable to map renderer memory.";
+    RecordAction(UserMetricsAction("BadMessageTerminate_RWHVA1"));
     host_->GetProcess()->ReceivedBadMessage();
     return;
   }
 
+  if (shared_memory->mapped_size() < size_in_bytes) {
+    DLOG(ERROR) << "Shared memory too small for given rectangle";
+    RecordAction(UserMetricsAction("BadMessageTerminate_RWHVA2"));
+    host_->GetProcess()->ReceivedBadMessage();
+    return;
+  }
+#else
+  if (!shared_memory->Map(size_in_bytes)) {
+    DLOG(ERROR) << "Unable to map renderer memory.";
+    RecordAction(UserMetricsAction("BadMessageTerminate_RWHVA1"));
+    host_->GetProcess()->ReceivedBadMessage();
+    return;
+  }
+#endif
+
   if (last_swapped_surface_size_ != frame_size) {
     DLOG_IF(ERROR, damage_rect != gfx::Rect(frame_size))
         << "Expected full damage rect";
   }
   last_swapped_surface_size_ = frame_size;
   last_swapped_surface_scale_factor_ = frame_device_scale_factor;
 
   scoped_refptr<MemoryHolder> holder(new MemoryHolder(
       shared_memory.Pass(),
       frame_size,
@@ skipping 1844 matching lines @@
     RenderWidgetHost* widget) {
   return new RenderWidgetHostViewAura(widget);
 }
 
 // static
 void RenderWidgetHostViewPort::GetDefaultScreenInfo(WebScreenInfo* results) {
   GetScreenInfoForWindow(results, NULL);
 }
 
 }  // namespace content