Check for some extensions before calling potentially NULL GL entry points.

gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc b/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc
index b2900c1dc27839a56c0aec524024470a44377275..987c04bfb1b4d2936475f4caaec4aa508e46e074 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc
@@ -2250,8 +2250,18 @@ GLES2DecoderPassthroughImpl::DoRenderbufferStorageMultisampleCHROMIUM(
     GLenum internalformat,
     GLsizei width,
     GLsizei height) {
-  glRenderbufferStorageMultisampleANGLE(target, samples, internalformat, width,
-                                        height);
+  if (!feature_info_->feature_flags().chromium_framebuffer_multisample) {
+    return error::kUnknownCommand;
+  }
+
+  if (has_angle_framebuffer_multisample_) {
+    glRenderbufferStorageMultisampleANGLE(target, samples, internalformat,
+                                          width, height);
+  } else {
+    DCHECK(has_es3_);
+    glRenderbufferStorageMultisample(target, samples, internalformat, width,
+                                     height);
+  }
   return error::kNoError;
 }
 
@@ -2261,8 +2271,18 @@ error::Error GLES2DecoderPassthroughImpl::DoRenderbufferStorageMultisampleEXT(
     GLenum internalformat,
     GLsizei width,
     GLsizei height) {
-  glRenderbufferStorageMultisampleANGLE(target, samples, internalformat, width,
-                                        height);
+  if (!feature_info_->feature_flags().chromium_framebuffer_multisample) {
+    return error::kUnknownCommand;
+  }
+
+  if (has_angle_framebuffer_multisample_) {
+    glRenderbufferStorageMultisampleANGLE(target, samples, internalformat,
+                                          width, height);
+  } else {
+    DCHECK(has_es3_);
+    glRenderbufferStorageMultisample(target, samples, internalformat, width,
+                                     height);
+  }
   return error::kNoError;
 }
 
@@ -2346,6 +2366,10 @@ error::Error GLES2DecoderPassthroughImpl::DoQueryCounterEXT(
     int32_t sync_shm_id,
     uint32_t sync_shm_offset,
     uint32_t submit_count) {
+  if (!has_ext_disjoint_timer_query_) {
+    return error::kUnknownCommand;
+  }
+
   GLuint service_id = GetQueryServiceID(id, &query_id_map_);
 
   // Flush all previous errors
@@ -3018,13 +3042,23 @@ error::Error GLES2DecoderPassthroughImpl::DoDiscardFramebufferEXT(
     GLenum target,
     GLsizei count,
     const volatile GLenum* attachments) {
+  if (!feature_info_->feature_flags().ext_discard_framebuffer) {
+    return error::kUnknownCommand;
+  }
+
   // Validate that count is non-negative before allocating a vector
   if (count < 0) {
     InsertError(GL_INVALID_VALUE, "count cannot be negative.");
     return error::kNoError;
   }
   std::vector<GLenum> attachments_copy(attachments, attachments + count);
-  glDiscardFramebufferEXT(target, count, attachments_copy.data());
+
+  if (has_ext_discard_framebuffer_) {
+    glDiscardFramebufferEXT(target, count, attachments_copy.data());
+  } else {
+    DCHECK(has_es3_);
+    glInvalidateFramebuffer(target, count, attachments_copy.data());
+  }
   return error::kNoError;
 }