Added vertex attribute tests.
Added vertex attribute tests.

TRAC #23776

Signed-off-by: Jamie Madill
Signed-off-by: Shannon Woods

crezefire/angle,android-ia/platform_external_chromium_org_third_party_angle,mikolalysenko/angle,mikolalysenko/angle,csa7mdm/angle,mlfarrell/angle,vvuk/angle,ghostoy/angle,nandhanurrevanth/angle,larsbergstrom/angle,MIPS/external-chromium_org-third_party-angle,ecoal95/angle,vvuk/angle,ecoal95/angle,crezefire/angle,larsbergstrom/angle,mlfarrell/angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,android-ia/platform_external_chromium_org_third_party_angle,mrobinson/rust-angle,nandhanurrevanth/angle,MIPS/external-chromium_org-third_party-angle,MSOpenTech/angle,domokit/waterfall,mrobinson/rust-angle,android-ia/platform_external_chromium_org_third_party_angle,MIPS/external-chromium_org-third_party-angle,ghostoy/angle,larsbergstrom/angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,xin3liang/platform_external_chromium_org_third_party_angle,ecoal95/angle,MSOpenTech/angle,mrobinson/rust-angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,MSOpenTech/angle,jgcaaprom/android_external_chromium_org_third_party_angle,MIPS/external-chromium_org-third_party-angle,bsergean/angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,ghostoy/angle,csa7mdm/angle,bsergean/angle,nandhanurrevanth/angle,mrobinson/rust-angle,mybios/angle,crezefire/angle,jgcaaprom/android_external_chromium_org_third_party_angle,nandhanurrevanth/angle,jgcaaprom/android_external_chromium_org_third_party_angle,domokit/waterfall,ecoal95/angle,ghostoy/angle,ppy/angle,mybios/angle,ecoal95/angle,bsergean/angle,crezefire/angle,jgcaaprom/android_external_chromium_org_third_party_angle,xin3liang/platform_external_chromium_org_third_party_angle,vvuk/angle,MSOpenTech/angle,mybios/angle,csa7mdm/angle,csa7mdm/angle,mikolalysenko/angle,mikolalysenko/angle,mlfarrell/angle,mlfarrell/angle,ppy/angle,vvuk/angle,xin3liang/platform_external_chromium_org_third_party_angle,xin3liang/platform_external_chromium_org_third_party_angle,ppy/angle,mybios/angle,ppy/angle,android-ia/platform_external_chromium_org_third_party_angle,larsbergstrom/angle,mrobinson/rust-angle,bsergean/angle