Allow variable names with length of up to 256 characters (this is required by WebGL spec). BUG=109 TEST=the 256-character variable test in glsl-conformance.html passes
Allow variable names with length of up to 256 characters (this is required by WebGL spec).
BUG=109
TEST=the 256-character variable test in glsl-conformance.html passes

Review URL: http://codereview.appspot.com/3981050

git-svn-id: 947ae547afacb859f3991e003b9d6feb04be57d7@552 736b8ea6-26fd-11df-bfd4-992fa37f6226

dumganhar/angleproject,xin3liang/platform_external_chromium_org_third_party_angle,dumganhar/angleproject,adobe/angle.js,Mustaavalkosta/android_external_angle,MIPS/external-chromium_org-third_party-angle,jgcaaprom/android_external_chromium_org_third_party_angle,Mustaavalkosta/android_external_angle,jgcaaprom/android_external_chromium_org_third_party_angle,dumganhar/angleproject,adobe/angle.js,spurious/angle-mirror,Mustaavalkosta/android_external_angle,xin3liang/platform_external_chromium_org_third_party_angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,adobe/angle.js,MIPS/external-chromium_org-third_party-angle,MIPS/external-chromium_org-third_party-angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,android-ia/platform_external_chromium_org_third_party_angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,spurious/angle-mirror,android-ia/platform_external_chromium_org_third_party_angle,Mustaavalkosta/android_external_angle,jgcaaprom/android_external_chromium_org_third_party_angle,xin3liang/platform_external_chromium_org_third_party_angle,android-ia/platform_external_chromium_org_third_party_angle,jgcaaprom/android_external_chromium_org_third_party_angle,adobe/angle.js,dumganhar/angleproject,MIPS/external-chromium_org-third_party-angle,spurious/angle-mirror,spurious/angle-mirror,xin3liang/platform_external_chromium_org_third_party_angle,android-ia/platform_external_chromium_org_third_party_angle