hwui: fix possible null pointer de-refrence

add layer check for  null before de-refrencing it.

issue link: http://code.google.com/p/android/issues/detail?id=61622

Change-Id: I54fc21ec594effcfb1eededd80dd5b0b52645c4c
Fix the texture ID reuse issue in HWUI.

Issue: When the layer of previous frame is destroyed, it doesn't clear the
texture id in mBoundTextures[mTextureUnit], so in the next frame, if
glGenTexture returns same texture ID of the previous frame,
the new texture is not bound.

CRs-fixed: 671736

Change-Id: Ifc5fd2115fb1863b3c006ab14b0faabeaeb4eab4
[Asset Manager] Fix memory leakage bug

Symptom: memory leakage
Root Cause: new SortedVector but not free it in native cpp
Solution: free the SortedVector
Project: AOSP
Note:

Change-Id: Iab5a7f2e8d8509631301e7231427927d4797c856
update parameters in uploadToTexture() for GLES20

Google optimized the uploadToTexture with GLES3.0+,
This allows us to upload a sub-rectangle of texture,
but this has compliance issue with GLES 2.0.

With OpenGL ES 2.0 we need to copy the bitmap in a
temporary buffer if the stride doesn't match the width,
and then upload entire temporary stripes.

Change-Id: I8987cd8347913c61b7fa45bd47be1189aa6bdb05
Signed-off-by: Shenghua Lu <shenghua.lu@intel.com>
Signed-off-by: Shuo Gao <shuo.gao@intel.com>
Signed-off-by: Guobin Zhang<guobin.zhang@intel.com>
Merge remote branch 'aokp/kitkat' into kitkat