Fixes handling in eglMakeCurrent to allow for null displays.
Fixes handling in eglMakeCurrent to allow for null displays.

TRAC #23577

On behalf of callow.mark@artspark.co.jp
Landed-by: Shannon Woods
Signed-off-by: Jamie Madill
Signed-off-by: Geoff Lang

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