Add a gpu driver bug workaround to count in all varyings in packing check.

gpu/command_buffer/service/program_manager_unittest.cc

Index: gpu/command_buffer/service/program_manager_unittest.cc
diff --git a/gpu/command_buffer/service/program_manager_unittest.cc b/gpu/command_buffer/service/program_manager_unittest.cc
index d52d3d7265423d3e88130439e63bf9f8964dc8a3..ec119851aacc2e8f1a6705afa1d05ed45d6e1aab 100644
--- a/gpu/command_buffer/service/program_manager_unittest.cc
+++ b/gpu/command_buffer/service/program_manager_unittest.cc
@@ -1375,7 +1375,8 @@ TEST_F(ProgramManagerWithShaderTest, TooManyVaryings) {
   Program* program = SetupShaderVariableTest(
       kVertexVaryings, 2, kFragmentVaryings, 2);
 
-  EXPECT_FALSE(program->CheckVaryingsPacking());
+  EXPECT_FALSE(
+      program->CheckVaryingsPacking(Program::kCountOnlyStaticallyUsed));
   EXPECT_TRUE(LinkAsExpected(program, false));
 }
 
@@ -1392,10 +1393,28 @@ TEST_F(ProgramManagerWithShaderTest, TooManyInactiveVaryings) {
   Program* program = SetupShaderVariableTest(
       kVertexVaryings, 2, kFragmentVaryings, 2);
 
-  EXPECT_TRUE(program->CheckVaryingsPacking());
+  EXPECT_TRUE(
+      program->CheckVaryingsPacking(Program::kCountOnlyStaticallyUsed));
   EXPECT_TRUE(LinkAsExpected(program, true));
 }
 
+// Varyings go over 8 rows but some are inactive.
+// However, we still fail the check if kCountAll option is used.
+TEST_F(ProgramManagerWithShaderTest, CountAllVaryingsInPacking) {
+  const VarInfo kVertexVaryings[] = {
+      { SH_FLOAT_VEC4, 4, SH_PRECISION_MEDIUMP, 1, "a", kVarVarying },
+      { SH_FLOAT_VEC4, 5, SH_PRECISION_MEDIUMP, 1, "b", kVarVarying }
+  };
+  const VarInfo kFragmentVaryings[] = {
+      { SH_FLOAT_VEC4, 4, SH_PRECISION_MEDIUMP, 0, "a", kVarVarying },
+      { SH_FLOAT_VEC4, 5, SH_PRECISION_MEDIUMP, 1, "b", kVarVarying }
+  };
+  Program* program = SetupShaderVariableTest(
+      kVertexVaryings, 2, kFragmentVaryings, 2);
+
+  EXPECT_FALSE(program->CheckVaryingsPacking(Program::kCountAll));
+}
+
 TEST_F(ProgramManagerWithShaderTest, ClearWithSamplerTypes) {
   const GLuint kVShaderClientId = 2001;
   const GLuint kFShaderClientId = 2002;