Show "No preview available" when no preview is loaded.

Change-Id: I2a3377a6c90ee1b0236954d45548e2ec284c6bee
Make IconPackHelper a member of IconPreviewHelper

Change-Id: Id98842f8102bc77802a424710931906395a2d3be
ThemeChooser : Scale iconSize in previews

- Use FIT_CENTER to ensure the icon is scaled within bounds
- Set weight property to ensure even space distribution
- Set default icon size on the resulting icon drawable

Change-Id: I83ff2bac5bf0aad739f39e0c0b4aff20c231c5d4
Allow filtering components when viewing a specific theme.

Change-Id: Ic3dbf42104549e80c1c0dce447c94b72868ea084
Merge "Show "No preview available" when no preview is loaded." into cm-11.0
Merge "Make IconPackHelper a member of IconPreviewHelper" into cm-11.0
Merge "Allow filtering components when viewing a specific theme." into cm-11.0
Merge "ThemeChooser : Scale iconSize in previews" into cm-11.0