Fix incorrect mip sizes for cube maps when creating them with TexStorage2D.
Fix incorrect mip sizes for cube maps when creating them with TexStorage2D.

TRAC #23913

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

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