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This is the first of multiple patches that clean up handling of memory
regarding images. Previously, the code did several memcpy()s or
equivalents. This change:
- Creates an abstract interface RefCountedMemory which provides access to the
front() of a memory range and the size() of it. It is a RefCountedThreadSafe.
- Adds a RefCountedStaticMemory class which isa RefCountedMemory.
- Pushes RefCountedBytes up into base/ from chrome/ and make it conform to
RefCountedMemory.
- Have ResourceBundle return RefCountedStaticMemory to the mmaped() or DLL
loaded resources instead of memcpy()ing them.
- General cleanups to minimize copies in constructing RefCountedBytes.
- Use the above consistent interface in the BrowserThemeProvider, along with
special casing the loading of the new tab page background.
This patch is mostly cleanups and there should only be a slight performance
gain if any. Most of the real speedups should come in subsequent patches.
BUG=http://crbug.com/24493
TEST=Slightly faster on Perf bot; does not introduce crashes.
Review URL: http://codereview.chromium.org/288005
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@29412 0039d316-1c4b-4281-b951-d872f2087c98
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