Support BufferData with size zero.
Support BufferData with size zero.

TRAC #12027

Signed-off-by: Shannon Woods
Signed-off-by: Daniel Koch

Author:    Andrew Lewycky

git-svn-id: a070b70d2b8c44c266a3870c0cddd9a0ee470458@191 736b8ea6-26fd-11df-bfd4-992fa37f6226

mikolalysenko/angle,vvuk/angle,xin3liang/platform_external_chromium_org_third_party_angle_dx11,ecoal95/angle,csa7mdm/angle,ecoal95/angle,android-ia/platform_external_chromium_org_third_party_angle,bsergean/angle,shairai/angleproject,cvsuser-chromium/chromium-third-party_angle_dx11,mlfarrell/angle,xin3liang/platform_external_chromium_org_third_party_angle,ppy/angle,cvsuser-chromium/chromium-third-party_angle_dx11,pombreda/angleproject,shairai/angleproject,android-ia/platform_external_chromium_org_third_party_angle_dx11,crezefire/angle,android-ia/platform_external_chromium_org_third_party_angle_dx11,android-ia/platform_external_chromium_org_third_party_angle,bsergean/angle,csa7mdm/angle,bsergean/angle,vvuk/angle-old,cvsuser-chromium/chromium-third-party_angle_dx11,jgcaaprom/android_external_chromium_org_third_party_angle,KTXSoftware/angleproject,MSOpenTech/angle,jgcaaprom/android_external_chromium_org_third_party_angle,RepublicMaster/angleproject,mybios/angle,stammen/angleproject,xuxiandi/angleproject,mlfarrell/angle,android-ia/platform_external_chromium_org_third_party_angle,ehsan/angle,domokit/waterfall,shairai/angleproject,nandhanurrevanth/angle,ehsan/angle,themusicgod1/angleproject,MSOpenTech/angle-win8.0,jgcaaprom/android_external_chromium_org_third_party_angle,android-ia/platform_external_chromium_org_third_party_angle_dx11,larsbergstrom/angle,mybios/angle,vvuk/angle-old,RepublicMaster/angleproject,mrobinson/rust-angle,mikolalysenko/angle,MSOpenTech/angle,ecoal95/angle,larsbergstrom/angle,pombreda/angleproject,ghostoy/angle,KTXSoftware/angleproject,ppy/angle,xuxiandi/angleproject,KalebDark/angleproject,nandhanurrevanth/angle,MIPS/external-chromium_org-third_party-angle,bsergean/angle,KalebDark/angleproject,mlfarrell/angle,crezefire/angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,ehsan/angle,pombreda/angleproject,csa7mdm/angle,cantren/angleproject,pombreda/angleproject,android-ia/platform_external_chromium_org_third_party_angle_dx11,themusicgod1/angleproject,ghostoy/angle,themusicgod1/angleproject,mybios/angle,mlfarrell/angle,ecoal95/angle,themusicgod1/angleproject,ehsan/angle,xuxiandi/angleproject,MIPS/external-chromium_org-third_party-angle_dx11,KTXSoftware/angleproject,xin3liang/platform_external_chromium_org_third_party_angle_dx11,MSOpenTech/angle-win8.0,csa7mdm/angle,MSOpenTech/angle-win8.0,mrobinson/rust-angle,KalebDark/angleproject,ecoal95/angle,crezefire/angle,mrobinson/rust-angle,xuxiandi/angleproject,larsbergstrom/angle,ghostoy/angle,crezefire/angle,android-ia/platform_external_chromium_org_third_party_angle,mikolalysenko/angle,MIPS/external-chromium_org-third_party-angle_dx11,vvuk/angle,larsbergstrom/angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,RepublicMaster/angleproject,stammen/angleproject,KalebDark/angleproject,ppy/angle,nandhanurrevanth/angle,MIPS/external-chromium_org-third_party-angle_dx11,MSOpenTech/angle-win8.0,nandhanurrevanth/angle,MSOpenTech/angle,mrobinson/rust-angle,mrobinson/rust-angle,mikolalysenko/angle,ppy/angle,MIPS/external-chromium_org-third_party-angle,MIPS/external-chromium_org-third_party-angle_dx11,shairai/angleproject,geekboxzone/lollipop_external_chromium_org_third_party_angle,MIPS/external-chromium_org-third_party-angle,jgcaaprom/android_external_chromium_org_third_party_angle,vvuk/angle,stammen/angleproject,stammen/angleproject,MSOpenTech/angle,xin3liang/platform_external_chromium_org_third_party_angle,ghostoy/angle,cantren/angleproject,vvuk/angle-old,geekboxzone/lollipop_external_chromium_org_third_party_angle,cantren/angleproject,xin3liang/platform_external_chromium_org_third_party_angle_dx11,xin3liang/platform_external_chromium_org_third_party_angle,domokit/waterfall,RepublicMaster/angleproject,cantren/angleproject,KTXSoftware/angleproject,KTXSoftware/angleproject,vvuk/angle,MIPS/external-chromium_org-third_party-angle,mybios/angle,vvuk/angle-old,xin3liang/platform_external_chromium_org_third_party_angle,cvsuser-chromium/chromium-third-party_angle_dx11,xin3liang/platform_external_chromium_org_third_party_angle_dx11