Mac: UI tweaks for task manager.

Nib change: Reduce row height, make scrollbars smaller.

Make text in task manager table slightly smaller.

Show in decimal digit for %cpu.

Show memory in KB/MB, not always in K.

Change update frequency from 1s to 2s to match Activity Monitor's default.

(all mac-only. ui team is fine with this.)

Finally, turn taskman on.

BUG=13156
TEST=Open task manager, look at it. Should look & feel similar to Activity Monitor.

Review URL: http://codereview.chromium.org/536038

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@36096 0039d316-1c4b-4281-b951-d872f2087c98

• base/process_util.h[diff]
• base/process_util_linux.cc[diff]
• base/process_util_mac.mm[diff]
• base/process_util_win.cc[diff]
• base/string_util.cc[diff]
• base/string_util.h[diff]
• base/string_util_unittest.cc[diff]
• base/trace_event.cc[diff]
• chrome/app/nibs/TaskManager.xib[diff]
• chrome/browser/browser.cc[diff]
• chrome/browser/cocoa/task_manager_mac.mm[diff]
• chrome/browser/task_manager.cc[diff]
• chrome/browser/task_manager.h[diff]