Move DIP translation from ui/aura to ui/compositor.

Layer's coordinate system is now in DIP.
Added support of dynamic density switching.
Removed ENABLE_DIP gyp/macro and added runtime flag "--ui-enable-dip"

BUG=105165, 114666
TEST=enabled monitor test. added new tests to compositor_unittests

Review URL: https://chromiumcodereview.appspot.com/10221028

git-svn-id: http://src.chromium.org/svn/trunk/src/build@135888 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

common.gypi

@@ -29,9 +29,6 @@
           # Whether or not we are building the Ash shell.
           'use_ash%': 0,
 
-          # Enable DIP (Density Independent Pixels) support.
-          'enable_dip%': 0,
-
           # Use OpenSSL instead of NSS. Under development: see http://crbug.com/62803
           'use_openssl%': 0,
 
@@ -55,7 +52,6 @@
         'chromeos%': '<(chromeos)',
         'use_aura%': '<(use_aura)',
         'use_ash%': '<(use_ash)',
-        'enable_dip%': '<(enable_dip)',
         'use_openssl%': '<(use_openssl)',
         'use_virtual_keyboard%': '<(use_virtual_keyboard)',
         'enable_viewport%': '<(enable_viewport)',
@@ -117,7 +113,6 @@
       'toolkit_views%': '<(toolkit_views)',
       'use_aura%': '<(use_aura)',
       'use_ash%': '<(use_ash)',
-      'enable_dip%': '<(enable_dip)',
       'use_openssl%': '<(use_openssl)',
       'use_virtual_keyboard%': '<(use_virtual_keyboard)',
       'enable_viewport%': '<(enable_viewport)',
@@ -503,7 +498,6 @@
     'ui_compositor_image_transport%': '<(ui_compositor_image_transport)',
     'use_aura%': '<(use_aura)',
     'use_ash%': '<(use_ash)',
-    'enable_dip%': '<(enable_dip)',
     'use_openssl%': '<(use_openssl)',
     'use_nss%': '<(use_nss)',
     'os_bsd%': '<(os_bsd)',
@@ -1256,9 +1250,6 @@
       ['use_ash==1', {
         'defines': ['USE_ASH=1'],
       }],
-      ['enable_dip==1', {
-        'defines': ['ENABLE_DIP'],
-      }],
       ['use_nss==1', {
         'defines': ['USE_NSS=1'],
       }],