Webkit: Fixed fuzzy word font issue in browser

the GL_LINEAR is more accurate wrt to texture mapping compared to
GL_NEAREST & usage of GL_LINEAR filtering is helping in fixing the
issue.

Change-Id: Ie13ad0fe419409f1a67cfb5b1089c925fe62ae99
CRs-fixed: 446916
fix ambiguous conversion errors for gcc 4.8

Change-Id: Ifa1a4073a805485a38344a7170ce381e6f0bbbd9

Conflicts:
	Source/WebCore/platform/audio/android/AudioBusAndroid.cpp
	Source/WebKit/android/webaudio/WebAudioDecoderAndroid.cpp
Android.mk: enable pld optimizations on krait

Conflicts:
	Android.mk
WebAudio: fix ambiguous conversions

Change-Id: I9d97c1a52ad3d28facf3c087b43062b697b98af6