build/phone-xhdpi-1024-dalvik-heap.mk Revert AOSP heapgrowthlimit change from 64 to 96

This reverts part of AOSP change at

https://android.googlesource.com/platform/frameworks/native/+/c84e9844d621223d14178be521

Possible performance issues have arisen because of it. Discussion at

http://code.google.com/p/android/issues/detail?id=40961

Patch Set 2: Clean up commit message

Change-Id: Id7e3324607f92553a98e4d47da58a322e4fba657
frameworks/native: Increase EGL blob cache size limits

Increase the size of the EGL Blob Cache to 2MB and the key size to 4K.
This helps improve the performance of OpenGL apps, especially Open GLESv1.1
apps whose shaders are generated on the fly.

CRs-fixed: 393074

Change-Id: Ic3772a9722b63351c940d40794cf54073a8b5eed
Changed default XHDPI dalvik heap
Revert "frameworks/native: Increase EGL blob cache size limits"

This reverts commit c8a04f4ccb8ac3d298227183aa4b015b40a816a3.
frameworks/native: fix copy back dirty region

Copyback dirty region logic does copyback,
even when its not necessary causing 2ms delay.
Fix the logic to copy back only what is necessary.

Change-Id: I52de68258ac9f87d704ee5401f93417805fa6773