Made zone segments aligned in memory and included a pointer to the zone in the header. Larger objec…

src/base/platform/platform.h

Index: src/base/platform/platform.h
diff --git a/src/base/platform/platform.h b/src/base/platform/platform.h
index d3b6c9c1cf3d758276ccc39c50a20b51fc9f9f98..93d8d2cce2ab006150d286e2e406dd591adb2c1d 100644
--- a/src/base/platform/platform.h
+++ b/src/base/platform/platform.h
@@ -295,8 +295,7 @@ class VirtualMemory {
   explicit VirtualMemory(size_t size);
 
   // Reserves virtual memory containing an area of the given size that
-  // is aligned per alignment. This may not be at the position returned
-  // by address().
+  // is aligned per alignment.
   VirtualMemory(size_t size, size_t alignment);
 
   // Construct a virtual memory by assigning it some already mapped address
@@ -308,25 +307,20 @@ class VirtualMemory {
   ~VirtualMemory();
 
   // Returns whether the memory has been reserved.
-  bool IsReserved();
+  bool IsReserved() const;
 
   // Initialize or resets an embedded VirtualMemory object.
   void Reset();
 
   // Returns the start address of the reserved memory.
-  // If the memory was reserved with an alignment, this address is not
-  // necessarily aligned. The user might need to round it up to a multiple of
-  // the alignment to get the start of the aligned block.
-  void* address() {
+  void* address() const {
     DCHECK(IsReserved());
     return address_;
   }
 
   // Returns the size of the reserved memory. The returned value is only
   // meaningful when IsReserved() returns true.
-  // If the memory was reserved with an alignment, this size may be larger
-  // than the requested size.
-  size_t size() { return size_; }
+  size_t size() const { return size_; }
 
   // Commits real memory. Returns whether the operation succeeded.
   bool Commit(void* address, size_t size, bool is_executable);