Workaround Linux AMD driver bug where TEXTURE_MAX_ANISOTROPY init value is incorrect.

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 394479dfd5dfcf2cb6b37d2cc8b819335b89a27b..855561765f62fe8133431a78248fc0b14a9c4c21 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -1265,6 +1265,11 @@ class GLES2DecoderImpl : public GLES2Decoder,
   // Wrapper for glGetShaderiv
   void DoGetShaderiv(GLuint shader, GLenum pname, GLint* params);
 
+  // Wrappers for glGetTexParameter.
+  void DoGetTexParameterfv(GLenum target, GLenum pname, GLfloat* params);
+  void DoGetTexParameteriv(GLenum target, GLenum pname, GLint* params);
+  void InitTextureMaxAnisotropyIfNeeded(GLenum target, GLenum pname);
+
   // Wrappers for glGetVertexAttrib.
   void DoGetVertexAttribfv(GLuint index, GLenum pname, GLfloat *params);
   void DoGetVertexAttribiv(GLuint index, GLenum pname, GLint *params);
@@ -6863,6 +6868,39 @@ void GLES2DecoderImpl::GetVertexAttribHelper(
   }
 }
 
+void GLES2DecoderImpl::DoGetTexParameterfv(
+    GLenum target, GLenum pname, GLfloat* params) {
+  InitTextureMaxAnisotropyIfNeeded(target, pname);
+  glGetTexParameterfv(target, pname, params);
+}
+
+void GLES2DecoderImpl::DoGetTexParameteriv(
+    GLenum target, GLenum pname, GLint* params) {
+  InitTextureMaxAnisotropyIfNeeded(target, pname);
+  glGetTexParameteriv(target, pname, params);
+}
+
+void GLES2DecoderImpl::InitTextureMaxAnisotropyIfNeeded(
+    GLenum target, GLenum pname) {
+  if (!workarounds().init_texture_max_anisotropy)
+    return;
+  if (pname != GL_TEXTURE_MAX_ANISOTROPY_EXT ||
+      !validators_->texture_parameter.IsValid(pname)) {
+    return;
+  }
+
+  TextureRef* texture_ref = texture_manager()->GetTextureInfoForTarget(
+      &state_, target);
+  if (!texture_ref) {
+    LOCAL_SET_GL_ERROR(
+        GL_INVALID_OPERATION,
+        "glGetTexParamter{fi}v", "unknown texture for target");
+    return;
+  }
+  Texture* texture = texture_ref->texture();
+  texture->InitTextureMaxAnisotropyIfNeeded(target);
+}
+
 void GLES2DecoderImpl::DoGetVertexAttribfv(
     GLuint index, GLenum pname, GLfloat* params) {
   VertexAttrib* attrib = state_.vertex_attrib_manager->GetVertexAttrib(index);